Synthesis 2005(8): 1319-1325  
DOI: 10.1055/s-2005-865283
PAPER
© Georg Thieme Verlag Stuttgart · New York

Stereoselective Synthesis of (E)-β-Arylvinyl Bromides by Microwave-Induced Hunsdiecker-Type Reaction

Chunxiang Kuang*a, Qing Yangb, Hisanori Senbokuc, Masao Tokudac
a Department of Materials Chemistry, Graduate School of Engineering, Osaka University, Suita 565-0871, Japan
Fax: +81(6)68505785; e-Mail: kuang@ch.wani.osaka-u.ac.jp;
b Division of Applied Bioscience, Graduate School of Agriculture, Hokkaido University, Sapporo, 060-8589, Japan
c Division of Molecular Chemistry, Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Japan
Further Information

Publication History

Received 2 December 2004
Publication Date:
23 March 2005 (online)

Abstract

(E)-β-Arylvinyl bromides were readily prepared in a short reaction time (1-2 min) by microwave irradiation of the corresponding 3-arylpropenoic acids in the presence of N-bromosuccinimide and a catalytic amount of lithium acetate. Furthermore, two facile strategies for the efficient synthesis of (E)-β-bromo-4-arylethynylstyrene and (E)-β-bromo-4-arylstyrene have been developed by respectively combining Sonogashira and Suzuki coupling reaction with Hunsdiecker-type reaction. Formation of cis-α-bromo-β-lactone by microwave irradiation of cis-cinnamic acid with NBS provides a useful support for the mechanistic study of the present halodecarboxylation reaction.

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cis-3-Bromo-4-phenyloxetan-2-one (4) was prepared from cis-cinnamic acid in 85% yield according to the general procedure. The physical data of 4 are as follows: colorless oil; IR (neat): 1844 cm-1 (β-lactone C=O); 1H NMR (270 MHz, CDCl3): δ = 5.58 (1 H, d, J = 5.94 Hz), 5.74 (1 H, d, J = 5.94 Hz), 7.36-7.45 (5 H, m); EIMS: m/z (%) = 228 [(M + 2)+, 24], 226 (M+, 25), 182 (M+ - CO2, 100); HRMS: m/z calcd for C9H7 79BrO2 [M+]: 225.9629; found: 225.9627.