Cyanoesterification of 1,2-Dienes: Synthesis and Transformations of Highly Functionalized α-Cyanomethylacrylate Esters
作者:Yoshiaki Nakao、Yasuhiro Hirata、Tamejiro Hiyama
DOI:10.1021/ja0606834
日期:2006.6.1
found to effect regioselective addition of cyanoformate esters across 1,2-dienes, giving rise to 3-alkoxycarbonyl-3-butenenitriles. Functional groups such as cyano, protected hydroxyl, and amino groups in the 1,2-diene substrates are tolerated. Isomerization of the initial products to thermodynamically more stable isomers takes place possibly through further oxidative addition of the C-CN bond of
发现 Ni/PMe2Ph 催化剂影响氰基甲酸酯在 1,2-二烯上的区域选择性加成,产生 3-烷氧基羰基-3-丁烯腈。1,2-二烯底物中的官能团如氰基、受保护的羟基和氨基是可以容忍的。初始产物异构化为热力学更稳定的异构体可能是通过将 3-烷氧基羰基-3-丁烯腈的 C-CN 键进一步氧化加成到 Ni(0) 上,然后还原消除而发生的。在 Ni/P(4-CF3-C6H4)3 催化剂存在下,氰基酯化产物通过炔烃进一步加成。