Palladium catalyzed intermolecular hydroamination of 1-substituted allenes: an atom-economical method for the synthesis of N-allylamines
作者:John F. Beck、Danielle C. Samblanet、Joseph A. R. Schmidt
DOI:10.1039/c3ra43870h
日期:——
linear products could be formed selectively in the hydroamination of p-fluorophenylallene with alkyl amines through careful control of [(3IPtBu)Pd(allyl)]OTf catalyst loading and reaction duration. Overall, the branched allylamines produced are useful synthetic intermediates due to their available unsaturated vinyl group, while the linear allylamine products are chemically similar to a class of known pharmaceuticals
钯配合物 [(3IPtBu)Pd(allyl)]OTf 之前表现出优异的催化活性,可用于 1,1-二甲基丙二烯与苯胺的加氢胺化,选择性地产生高转化率的支链取代烯丙胺产物(动力学产物)。在目前的报告中,这种加氢胺化反应的范围已扩大到包括烷基胺和苯胺以及一系列七种烷基和芳基丙二烯。对于所研究的大多数胺,1,1-二甲基丙二烯、环己基丙二烯、苄基丙二烯和选择的芳基丙二烯与烷基胺的加氢胺化在环境温度下在不到 1 小时内几乎定量地转化为支链取代的烯丙胺产物。相比之下,苯胺的反应范围更有限,并与除 1,1-二甲基丙二烯以外的所有丙二烯生成线性加氢胺化产物(热力学产物)。通过仔细控制 [(3IPtBu)Pd(allyl)]OTf 催化剂的负载量和反应持续时间,可以在对氟苯基丙二烯与烷基胺的加氢胺化反应中选择性地形成支链和直链产物。总体而言,所生产的支链烯丙胺因其可用的不饱和乙烯基而成为有用的合成中间体,而