Stereoselective Suzuki−Miyaura Cross-Coupling Reactions of Potassium Alkenyltrifluoroborates with Alkenyl Bromides
作者:Gary A. Molander、Luciana A. Felix
DOI:10.1021/jo050286w
日期:2005.5.1
The stereoselective synthesis of conjugated dienes using air-stable potassium alkenyltrifluoroborates as coupling partners is described. The palladium-catalyzed cross-coupling reaction of potassium (E)- and (Z)-alkenyltrifluoroborates with either (E)- or (Z)-alkenyl bromides proceeds readily with moderate to excellent yields to give the corresponding (E,E)-, (E,Z)-, (Z,E)-, or (Z,Z)-conjugated dienes
描述了使用空气稳定的链烯基三氟硼酸钾作为偶联伴侣的立体选择性合成共轭二烯的方法。钯催化的(E)-和(Z)-烯基三氟硼酸钾与(E)-或(Z)-烯基溴化物的钯催化交叉偶联反应容易进行,产率中等至优异,得到相应的(E,E)- ,(E,Z)-,(Z,E)-或(Z,Z)共轭二烯立体定向。交叉耦合通常可使用5摩尔%的Pd(OAC)的实现2,10摩尔%的PPH 3和Cs的3当量2 CO 3在THF-H 2 O(10∶1)中。两种偶联伙伴均容许多种官能团。