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Synthesis of (1E,3E)-1,4-diarylbuta-1,3-dienes promoted by μ-OMs palladium–dimer complex

BMC Chemistry volume 13, Article number: 39 (2019) Cite this article

Abstract

A convenient approach for (1E,3E)-1,4-diarylbuta-1,3-dienes via intermolecular Heck reaction of olefins and β-bromostyrenes promoted by μ-OMs palladium–dimer complex has been successfully developed. The products 1,4-conjugated dienes could be obtained with good yield (up to 82%). The catalyst system has excellent chemical selectivity and group tolerance which could supply an alternative way to gain the valuable biaryl linkage building blocks. Furthermore, fluorescence studies of dienes showed that some of them may have potential applications as luminescent clusters.

Introduction

1,4-Diarylbuta-1,3-dienes are found not only as the important building blocks in polymers, but also in variety of synthetic/naturally occurring biologically active molecules, which possess a wide range of bioactivities [1,2,3,4]. Several methods have been developed for the synthesis of 1,3-dienes via cross-coupling reaction catalyzed by transition metal catalysts, such as Ni [5, 6], Cu [7, 8] and Pd [9, 10] (Fig. 1, equation 1). Some alternative methods were also reported. For example, 1,3-dienes could also be achieved via the Suzuki–Miyaura reaction between vinyl boric acid and vinyl bromides [11, 12] (Fig. 1, equation 2). The coupling of (1E,3E)-1,4-diiodobuta-1,3-diene with arylboronic reagents was reported for the synthesis of symmetrical 1,4-diarylbuta-1,3-dienes [13] (Fig. 1, equation 3). Controlled hydrogenation of the triple bond of 1,2-diphenylacetylenes under high pressure and temperature could lead to the formation of stilbenes without the formation of new C–C bond [14, 15] (Fig. 1, equation 4). Homocoupling of potassium alkenyltrifluoroborates is an effective method for the synthesis of symmetrical 1,3-dienes [16] (Fig. 1, equation 5). However, despite these major advances, discovery of new catalyst system for the construction of 1,3-diene units (both symmetrical and unsymmetrical ones) with good chemical selectivity and easy gained catalyst is still an attractive goal.

Fig. 1
figure 1

Representative synthetic strategies for 1,4-diarylbuta-1,3-dienes and our approach

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Heck reactions is one of the most important reaction among transition metal catalyzed C–C bond formation methods and many important catalyst systems have been achieved. However, most of the results which have been described with Pd catalysts, were obtained for the coupling of aryl halides [17,18,19,20,21]. Relatively few results have been reported with vinyl halides. The researchers have put more attentions to improve the Heck reaction conditions and catalysts such as immobilized catalyst, fluorine chemical, no phosphorus catalyst, et al. [22,23,24,25]. μ-OMs palladium–dimer was first reported by Buchwald, which was used as Pd-precatalyst for C–N/C–C coupling reactions [26]. Although, the μ-OMs dimer is very easy to obtain and always used as the optimal palladium source in many reactions, it has not been used directly as the catalyst for Heck reaction. For the long run, our research interests focus on the studies on noble metal salts catalyzed reactions [27,28,29,30,31,32]. As our continuous research interest, herein, we report that Pd–dimer (namely μ-OMs dimer) which is a typically non-phosphorus Buchwald Pd-precatalyst could be successfully applied in the Heck reaction of olefins and β-bromostyrenes affording 1,4-conjugated dienes with good yield and excellent chemical selectivity (Fig. 1b).

Results and discussion

To begin, we chose the Heck reaction between (E)-(2-bromovinyl)benzene (1a) and styrene (2a) in the presence of Pd(OAc)2 as the model system to optimize the reaction conditions for the synthesis of the product 3a. In an initial experiment, the reaction was performed in toluene at 80 °C catalyzed by 5 mol% Pd(OAc)2 with K2CO3 as the base, isolating (1E,3E)-1,4-diphenylbuta-1,3-diene (3a) in 19% yield after 24 h (Table 1, entry 1). Then, we investigated different palladium catalysts on the reaction yield and catalytic efficiency. As depicted in Table 1, when Pd2(dba)3 or Pd(TFA)2 was used in place of Pd(OAc)2, similar results were achieved (Table 1, entries 2–3). The homemade dimer palladium catalyst was then examined, and the results showed that its catalytic activity was superior to other palladium catalysts (entries 4 vs 1–3). To our surprise, when the coupling reaction was carried with traditional Xphos or PPh3 as supporting ligands and with μ-OMs dimer as palladium source, the results clearly indicated that both XPhos and PPh3 were the poor ligands for this transformation (Table 1, entries 5–6). When the reaction temperature was increased to 120 °C, the yield of the product improved significantly and the reaction time was also shortened (Table 1, entry 7).

Table 1 Optimization for the reaction condition
figure b
Full size table

Subsequently, different solvents were examined using μ-OMs Pd–dimer as the catalyst, in the presence of K2CO3 under an argon atmosphere. In a series of reaction solvent, we found that toluene as low polar solvent was the best one among the solvents screened. Polar aprotic solvents, such as DMF, NMP and DMSO gave almost the same level yield, while CH3CN gave much poor yield (Table 1, entries 8–11). Thus, toluene was used as the best solvent for further studies. Finally, we investigated the effect of bases on the reaction, including K3PO4, Li2CO3, Cs2CO3 and Et3N. Of the base screened, the best result was obtained with K2CO3 which could make the reaction faster and more efficiency (entry 6). Cs2CO3, K3PO4 and Et3N gave slightly inferior yield than K2CO3 (entries 13–15), while using Li2CO3 as the base gave complexed mixture which might due to the strong basicity of Li2CO3. The yield was reduced by reducing the amount of catalyst from 5 to 2.5% (Table 1, entry 16).

Under the above optimized reaction conditions, we explored the generality and applicability of the protocol. Firstly, the reaction between different styrenes and (E)-(2-bromovinyl)benzene was examined. When chlorine was in the ortho, meta- or para-position of benzene ring in styrene substrates, the para position substrate gave the highest yield of the corresponding product with 82%, while the ortho-position substrate gave the lowest yield which might due to the steric effect (Table 2, entries 1–3). Styrene with electron-donating group on the benzene ring, such as methyl group on the para- position, gave lower yield than that of electron withdrawing one (Table 2, entry 1 vs 4). A wide variety of vinyl bromides, bearing either electron-donating or electron-withdrawing substituents, were successfully coupled with styrene partner with 54–68% yield. Generally, electron-withdrawing groups have positive impacts on the building of conjugated dienes, compared with electronic-donating ones (Table 2, entries 5, 7, 11 vs 6, 8–9). Unfortunately, when R1 group was 4-Br, the reaction gave a messy mixture which may due to the different active reaction sites of the vinyl bromide (Table 2, entry 10). Interestingly, when R2 group was 4-Br, the reaction could proceed smoothly and afforded the corresponding product with 61% yield (Table 2, entry 16). The substituent on the aryl ring of β-bromostyrene such as a para-fluride, a para-cholor group decreased slightly the reaction rates and the yields (Table 2, entry 1 vs 12–13). An electron-donating substituent, such as a para-methyl group, on the aryl ring of β-bromostyrene could afford better yields than electron-withdrawing ones (Table 2, entries 12–13 vs 15, 2 vs 14).

Table 2 Scope of the reaction
figure c
Full size table

Interestingly, when the reaction between (Z)-(2-bromovinyl) benzene and styrene was examined, only (1E,3E)-diene was obtained which indicated that our catalyst system had excellent chemical selectivity (Fig. 2) [33].

Fig. 2
figure 2

Chemical selectivity of the reaction

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To broaden the possible usage of these compounds, the fluorescence activity of 3a, 3m and 3e was studied. As can be seen from Fig. 3, 3a and 3m showed fluorescence, and the excitation wavelength was 650 nm and 657 nm respectively, which reach the near infrared region. They may have potential applications as fluorescent materials. While at the same concentration, 3e has no fluorescence.

Fig. 3
figure 3

Fluorescence spectra of 3a, 3e and 3m (concentration: 10 μmol/L) upon excitation at 331 nm, 228 nm and 237 nm respectively. Samples were dissolved in DMSO/PBS (30%)

Full size image

Conclusions

In summary, we have successfully developed an approach for the synthesis of (1E,3E)-1,4-diarylbuta-1,3-dienes via intermolecular Heck reaction of olefins and β-bromostyrenes promoted by μ-OMs palladium–dimer complex catalyst. The products 1,4-conjugated dienes could be obtained with good yield (up to 82%). The catalyst system has good chemical selectivity and excellent group tolerance which would supply an alternative way to gain the valuable biaryl linkage building blocks.

Experimental

General information

Commercially available reagents were used without further purification. The solvents used for experiment research were all through pretreatment on condition of anaerobic and without water. Reactions were monitored by TLC using Silicycle precoated silica gel plates. Flash column chromatography was performed over Silicycle silica gel (300–400 mesh). 1H NMR and 13C NMR spectra were recorded on JMTC-400/54/SS 400 MHz spectrometers using residue solvent peaks as internal standards (CHCl3, 1H: 7.26 ppm; 13C: 77.00 ppm). The fluorescence spectra of samples were detected with a Fluorescence spectrophotometer (F-4600FL Spectrophotometer, Hitachi, Japan) using a Xenon lamp as the excitation source at room temperature, and the excitation wavelength was 331 nm, 228 nm and 237 nm.

General procedure for the synthesis of 1,4-diarylbuta-1,3-dienes

A Schlenk tube was charged with styrene (20.8 mg, 0.2 mmol), (E)-(2-bromovinyl) benzene (36.6 mg, 2.0 mmol), μ-OMs dimer (7.3 mg, 5% mmol), K2CO3 (55.3 mg, 2.0 mmol), and anhydrous toluene 1.0 mL under an Ar atmosphere. The Schlenk tube was sealed with a Teflon valve, and then the reaction mixture was stirred at 110 °C for 24 h, monitoring by TLC. After the reaction was completed, the reaction mixture was extracted with ethyl acetate three times. Then the filtrates were dried over Na2SO4 and concentrated under reduced pressure. The residue obtained was purified by chromatography (silica gel, PE–EtOAc, 100:1) to give the product.

Product characterization data

(1E,3E)-1,4-diphenylbuta-1,3-diene (3a) [34,35,36]

The product was obtained as white solid in 74% yield. 1H NMR (400 MHz, CDCl3) δ 7.44 (d, J = 7.4 Hz, 4H), 7.33 (t, J = 7.8 Hz, 4H), 7.24 (d, J = 5.6 Hz, 2H), 6.96 (dd, J = 12.0, 2.6 Hz, 2H), 6.67 (dd, J = 12.0, 2.6 Hz, 2H); 13C NMR (100 MHz, CDCl3) δ 137.3, 132.8, 129.2, 128.6, 127.5, 126.4 (see Additional file 1).

1-Chloro-4-((1E,3E)-4-phenylbuta-1,3-dien-1-yl)benzene (3b) [37]

The product was obtained as white solid in 82% yield. 1H NMR (400 MHz, CDCl3) δ 7.43 (d, J = 7.4 Hz, 2H), 7.39–7.20 (m, 7H), 7.02–6.84 (m, 2H), 6.75–6.53 (m, 2H); 13C NMR (100 MHz, CDCl3) δ 137.3, 136.0, 133.5, 131.5, 130.0, 129.0, 128.9, 128.8, 127.8, 127.6, 126.5 (see Additional file 1).

1-Chloro-3-((1E,3E)-4-phenylbuta-1,3-dien-1-yl)benzene (3c) [38]

The product was obtained as white solid in 61% yield. 1H NMR (400 MHz, CDCl3) δ 7.49–7.39 (m, 3H), 7.33 (t, J = 7.5 Hz, 2H), 7.29 (dt, J = 7.6, 1.5 Hz, 1H), 7.27–7.21 (m, 4H), 7.19 (dt, J = 7.6, 1.6 Hz, 1H), 7.00–6.85 (m, 2H), 6.78–6.64 (m, 1H), 6.64–6.53 (m, 1H); 13C NMR (100 MHz, CDCl3) δ 139.3, 137.1, 134.6, 133.9, 131.1, 130.6, 129.8, 128.7, 128.7, 127.8, 127.4, 126.5, 126.1, 124.5 (see Additional file 1).

1-Chloro-2-((1E,3E)-4-phenylbuta-1,3-dien-1-yl)benzene (3d) [39]

The product was obtained as white solid in 58% yield. 1H NMR (400 MHz, CDCl3) δ 7.62 (dd, J = 7.8, 1.4 Hz, 1H), 7.45 (d, J = 7.3 Hz, 2H), 7.39–7.30 (m, 3H), 7.29–7.20 (m, 4H), 7.15 (td, J = 7.7, 1.5 Hz, 1H), 7.11–6.88 (m, 3H), 6.71 (d, J = 15.1 Hz, 1H); 13C NMR (100 MHz, CDCl3) δ 137.1, 135.3, 133.9, 133.2, 131.6, 129.9, 129.1, 128.7, 128.4, 128.4, 127.8, 126.8, 126.2 (see Additional file 1).

1-Methyl-4-((1E,3E)-4-phenylbuta-1,3-dien-1-yl)benzene (3e) [40, 41]

The product was obtained as white solid in 68% yield. 1H NMR (400 MHz, CDCl3) δ 7.49–7.39 (m, 2H), 7.38–7.27 (m, 4H), 7.24–7.18 (m, 1H), 7.13 (d, J = 8.2 Hz, 2H), 7.01–6.80 (m, 2H), 6.64 (td, J = 10.7, 6.6 Hz, 2H), 2.34 (s, 3H); 13C NMR (100 MHz, CDCl3) δ 137.6, 137.6, 134.7, 132.9, 132.3, 129.5, 129.5, 128.7, 128.4, 127.5, 126.4, 21.4 (see Additional file 1).

1-Methoxy-4-((1E,3E)-4-phenylbuta-1,3-dien-1-yl)benzene (3f) [42]

The product was obtained as white solid in 55% yield. 1H NMR (400 MHz, CDCl3) δ 7.46–7.35 (m, 4H), 7.31 (t, J = 7.5 Hz, 2H), 7.23–7.17 (m, 1H), 7.01–6.73 (m, 4H), 6.61 (d, J = 15.1 Hz, 2H), 3.81 (s, 3H); 13C NMR (100 MHz, CDCl3) δ 159.3, 137.5, 132.4, 131.7, 129.5, 128.6, 127.6, 126.2, 114.1, 55.3 (see Additional file 1).

1-Fluoro-4-((1E,3E)-4-phenylbuta-1,3-dien-1-yl)benzene (3g) [41]

The product was obtained as white solid in 82% yield. 1H NMR (400 MHz, CDCl3) δ 7.50–7.37 (m, 4H), 7.33 (t, J = 7.5 Hz, 2H), 7.25–7.20 (m, 1H), 7.09–6.99 (m, 2H), 6.90 (qd, J = 14.9, 10.5 Hz, 2H), 6.65 (t, J = 14.4 Hz, 2H); 13C NMR (100 MHz, CDCl3) δ 163.7, 135.9, 133.5 (d, J = 3.8 Hz), 133.2, 132.2, 131.5, 129.7, 128.9, 128.7 (d, J = 1.9 Hz), 128.0 (d, J = 8.6 Hz), 127.6, 115.8 (d, J = 21.0 Hz) (see Additional file 1).

4-((1E,3E)-4-phenylbuta-1,3-dien-1-yl)phenylacetate (3h)

The product was obtained as white solid in 54% yield. 1H NMR (400 MHz, CDCl3) δ 7.43 (d, J = 8.7 Hz, 4H), 7.37–7.29 (m, 2H), 7.24–7.17 (m, 1H), 7.05 (dt, J = 9.3, 2.3 Hz, 2H), 7.00–6.78 (m, 2H), 6.72–6.59 (m, 2H), 2.33–2.24 (3H); 13C NMR (100 MHz, CDCl3) δ 169.5, 150.0, 137.3, 135.2, 133.0, 131.7, 129.5, 129.1, 128.7, 127.6, 127.3, 126.4, 121.8, 21.2; IR (cm−1): 3043, 2994, 2990, 1772, 1665, 1502, 1480, 1111, 990; HRMS ESI–TOF: m/z = 265.1134 [M+H]+ (265.1129 calcd for C18H17O2) (see Additional file 1).

1-Chloro-4-((2E,4E)-5-phenylpenta-2,4-dien-2-yl)benzene (3i) [43]

The product was obtained as white solid in 65% yield. 1H NMR (400 MHz, CDCl3) δ 7.53–7.38 (m, 4H), 7.37–7.27 (m, 4H), 7.24–7.03 (m, 2H), 6.77–6.55 (m, 2H), 2.21 (s, 3H); 13C NMR (100 MHz, CDCl3) δ 141.3, 137.5, 135.4, 133.4, 132.8, 128.7, 128.4, 127.7, 127.6, 126.8, 126.4, 125.5, 16.1 (see Additional file 1).

1-Chloro-4-((1E,3E)-4-(4-fluorophenyl)buta-1,3-dien-1-yl) benzene (3j) [44]

The product was obtained as white solid in 71% yield. 1H NMR (400 MHz, CDCl3) δ 7.48–7.34 (m, 4H), 7.33–7.27 (m, 2H), 7.03 (t, J = 7.8 Hz, 2H), 6.97–6.78 (m, 2H), 6.62 (t, J = 14.6 Hz, 2H); 13C NMR (100 MHz, CDCl3) δ 135.8, 133.4, 133.4, 132.1, 131.4, 129.6, 128.8, 127.9, 127.9, 115.8, 115.6 (see Additional file 1).

(1E,3E)-1,4-bis(4-chlorophenyl)buta-1,3-diene (3k) [45, 46]

The product was obtained as white solid in 63% yield. 1H NMR (400 MHz, CDCl3) δ 7.42–7.33 (m, 4H), 7.33–7.27 (m, 4H), 6.96–6.83 (m, 2H), 6.69–6.57 (m, 2H); 13C NMR (100 MHz, CDCl3) δ 135.7, 133.2, 131.9, 129.5, 128.9, 127.5 (see Additional file 1).

1-Chloro-3-((1E,3E)-4-(p-tolyl)buta-1,3-dien-1-yl)benzene (3l)

The product was obtained as white solid in 66% yield. 1H NMR (400 MHz, CDCl3) δ 7.46–7.41 (m, 1H), 7.36 (d, J = 8.2 Hz, 2H), 7.32–7.24 (m, 2H), 7.20 (dt, J = 7.6, 1.7 Hz, 1H), 7.16 (d, J = 7.8 Hz, 2H), 7.02–6.82 (m, 2H), 6.69 (d, J = 14.6 Hz, 1H), 6.58 (d, J = 14.6 Hz, 1H), 2.37 (s, 3H); 13C NMR (100 MHz, CDCl3) δ 139.4, 137.8, 134.6, 134.3, 133.9, 130.8, 130.5, 129.8, 129.4, 127.8, 127.2, 126.4, 126.1, 124.5; IR (cm−1): 3033, 2990, 2984, 1768, 1640, 1512, 1486, 1123; HRMS ESI-TOF: m/z = 255.0941 [M+H]+ (255.0947 calcd for C17H16Cl) (see Additional file 1).

1-Chloro-4-((1E,3E)-4-(p-tolyl)buta-1,3-dien-1-yl)benzene (3m) [44]

The product was obtained as white solid in 74% yield. 1H NMR (400 MHz, CDCl3) δ 7.43–7.33 (m, 4H), 7.33–7.29 (m, 2H), 7.16 (d, J = 7.8 Hz, 2H), 7.04–6.80 (m, 2H), 6.78–6.51 (m, 2H), 2.37 (s, 3H); 13C NMR (100 MHz, CDCl3) δ 137.7, 136.0, 134.4, 133.4, 132.9, 130.8, 130.0, 129.4, 128.8, 127.9, 127.4, 126.4, 21.3 (see Additional file 1).

1-Bromo-4-((1E,3E)-4-(4-fluorophenyl)buta-1,3-dien-1-yl)benzene (3n) [45, 46]

The product was obtained as white solid in 61% yield. 1H NMR (400 MHz, CDCl3) δ 7.53–7.35 (m, 4H), 7.29 (d, J = 8.2 Hz, 2H), 7.03 (t, J = 8.7 Hz, 2H), 6.96–6.77 (m, 2H), 6.73–6.53 (m, 2H); 13C NMR (100 MHz, CDCl3) δ 163.7, 136.5, 133.7 (d, J = 2.8 Hz), 132.5, 132.1, 131.7, 130.0, 128.9 (d, J = 1.9 Hz), 128.2 (d, J = 7.8 Hz), 128.1, 121.6, 115.9 (d, J = 20.0 Hz) (see Additional file 1).

Abbreviations

DMF:

dimethyl formamide

NMP:

N-methyl pyrrolidone

DMSO:

dimethyl sulfoxide

Ar:

argon gas

PBS:

phosphate buffer saline

TLC:

thin layer chromatography

PE:

petroleum ether

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Authors’ contributions

XZ, QZ and ZX conceived and designed the experiments; XZ, YZ and HC performed the experiments; XZ and NW data curation; XW analyzed the data; ZX wrote the paper. All authors read and approved the final manuscript.

Acknowledgements

The authors gratefully acknowledge the partial support from the Top-notch Academic Programs Project of Jiangsu Higher Education Institutions (PPZY2015B161). Dr. Xu thanks the Qing Lan Project of Jiangsu Province and 333 Project of Jiangsu Province.

Competing interests

The authors declare that they have no competing interests.

Availability of data and materials

All data are fully available without restriction.

Funding

This study was financially supported by Natural Science Foundation of Jiangsu Province (Grant No. BK 20171175) and Project of Science and Technology of Xuzhou Government (Grant No. KC16SG250). The work is also sponsored by Jiangsu Six Talent Peaks Program (YY-042).

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Authors and Affiliations

  1. School of Pharmacy, Xuzhou Medical University, Xuzhou, Jiangsu Province, China

    Xueliang Zhou, Yuan Zhou, Qiang Zhu, Huimin Chen, Nan Wu, Xiangru Wen & Zhou Xu

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  1. Xueliang Zhou
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  2. Yuan Zhou
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  3. Qiang Zhu
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  4. Huimin Chen
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  7. Zhou Xu
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Corresponding author

Correspondence to Zhou Xu.

Additional file

Additional file 1.

The synthesis of starting materials, general procedure for the products and 1H-NMR and 13C-NMR spectra of all products.

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Zhou, X., Zhou, Y., Zhu, Q. et al. Synthesis of (1E,3E)-1,4-diarylbuta-1,3-dienes promoted by μ-OMs palladium–dimer complex. BMC Chemistry 13, 39 (2019). https://doi.org/10.1186/s13065-019-0561-3

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Keywords

BMC Chemistry

ISSN: 2661-801X

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