Palladium-Free Synthesis of Conjugated Enynes by Direct Olefination of Terminal Alkynes Using Vinyl Bromides
作者:Yunyun Liu、Jianguo Yang、Weiliang Bao
DOI:10.1002/ejoc.200900954
日期:2009.11
A series of conjugatedenynes were successfully synthesized by the direct copper-catalyzed coupling reaction of vinylbromides and alkynes. The reaction proceeds smoothly in DMF at 110 °C to give the corresponding products in good to excellent yields. The protocol is tolerant to a broad range of functional groups on the substrates. Moreover, the products were furnished as specific E isomers, as the
catalyst catalyzed efficient cross-coupling of aryl and alkenylboronicacids with alkynyl-1,2-benziodoxol-3(1H)-ones to afford diaryl alkynes and enynes under mild visible light irradiation conditions using a catalytic amount of base or even in the absence of base. The reaction applies copper as the catalyst and tolerates a variety of functional moieties including aryl bromide and iodide.
我们在此报道了铜催化剂催化芳基和烯基硼酸与炔基-1,2-苯并氧醇-3(1 H )-酮的有效交叉偶联,在温和的可见光照射条件下使用催化量提供二芳基炔烃和烯炔基地或什至在没有基地的情况下。该反应使用铜作为催化剂,并耐受多种功能基团,包括芳基溴化物和碘化物。
Highly regio- and stereoselective synthesis of 1,3-enynes from unactivated ethylenes via palladium-catalyzed cross-coupling
An efficient procedure for regio- and stereoselective synthesis of a series of conjugated enynes by a simple Pd-catalyzed cross-coupling reaction of unactivated ethylenes and ethynyl bromide has been developed. The reaction proceeds smoothly in DMF to give the corresponding products in good to excellent yields. The protocol can tolerate a broad range of functional groups on the substrates. (C) 2011 Elsevier Ltd. All rights reserved.
De novo synthesis of functionalized 1,3-enynes and extended conjugated molecular systems
作者:Maddali L. N. Rao、Priyabrata Dasgupta、Venneti N. Murty
DOI:10.1039/c5ra01544h
日期:——
Pd-catalyzed coupling of 1,3-dienyldibromides with triarylbismuths was demonstrated for the synthesis of a diverse range of 1,3-enynes.