Highly Regiocontrolled Pd-Catalyzed Cross-Coupling Reaction of Terminal Alkynes and Allenylphosphine Oxides
作者:Michael Rubin、Jelena Markov、Stepan Chuprakov、Donald J. Wink、Vladimir Gevorgyan
DOI:10.1021/jo034486o
日期:2003.8.1
terminal alkynes 1 with allenylphosphine oxides 2 catalyzed by a Pd(OAc)(2)-TDMPP system provided conjugated endo-enynes 3 solely, while the TCPC-catalyzed reaction of the same regents led to the exclusive formation of exo-isomers 4. The mechanistic rationale for these selective transformations was proposed. Synthetic usefulness of the prepared exo-enyne 4 was demonstrated in the synthesis of multisubstituted
Pd(OAc)(2)-TDMPP系统催化的各种末端炔烃1与烯丙基膦氧化物2的交叉偶联仅提供了共轭内烯炔3,而相同试剂的TCPC催化反应导致了排他性炔烃3的排他性。外显异构体的形成4.提出了这些选择性转化的机理原理。经由Pd催化的[4 + 2]-苯并烷基化反应在多取代的二芳基苄基膦氧化物5的合成中证明了所制得的外烯-炔4的合成有用性。