Efficient synthesis of enynes by tetraphosphine–palladium-catalysed reaction of vinyl bromides with terminal alkynes
作者:Marie Feuerstein、Ludovic Chahen、Henri Doucet、Maurice Santelli
DOI:10.1016/j.tet.2005.09.124
日期:2006.1
Through the use of [PdCl(C3H5)]2/cis,cis,cis-1,2,3,4-tetrakis(diphenylphosphinomethyl)cyclopentane as catalyst, a range of vinyl bromides undergoes Sonogashira cross-coupling reaction with a variety of alkynes, leading to the corresponding 1,3-enynes in good yields. The reaction tolerates several alkynes such as phenylacetylene, dec-1-yne, 2-methylbut-1-en-3-yne a range of alk-1-ynols, 3,3-diethoxyprop-1-yne
通过使用[PdCl(C 3 H 5)] 2 /顺式,顺式,顺式-1,2,3,4-四(二苯基膦甲基)环戊烷作为催化剂,一定范围的乙烯基溴与各种炔烃进行Sonogashira交叉偶联反应,从而以高收率得到相应的1,3-烯炔。该反应可耐受几种炔烃,例如苯乙炔,癸-1-炔,2-甲基丁-1-烯-3-炔,一系列烷-1-炔醇,3,3-二乙氧基丙-1-炔和炔丙基胺。在苯乙炔,dec-1-yne,but-3-yn-1-ol,pent-4-yn-1-ol,3,3-dithoxyprop-1-yne或1,1存在下观察到更高的反应速率-二丙基-2-丙炔胺比与炔丙醇,3-甲氧基-丙-1-炔或2-甲基丁-1-烯-3-炔。该催化剂即使在空间受阻的乙烯基溴化物如溴代三苯基乙烯或2-溴-3-甲基-丁-2-烯的反应中也可以低负荷使用。