amination of allylicalcohols with primary and secondary amines catalyzed by a system made of [Ni(1,5‐cyclooctadiene)2] and 1,1′‐bis(diphenylphosphino)ferrocene was effectively enhanced by adding nBu4NOAc and molecular sieves, affording the corresponding allyl amines in high yield with high monoallylation selectivity for primary amines and high regioselectivity for monosubstituted allylicalcohols. Such remarkable
通过添加n Bu 4 NOAc和分子筛,可以有效地增强由[Ni(1,5-环辛二烯)2 ]和1,1'-双(二苯基膦基)二茂铁构成的体系催化的伯胺和仲胺对烯丙基醇的直接胺化作用。得到高产率的相应烯丙基胺,对伯胺具有高的单烯丙基化选择性,对单取代的烯丙基醇具有高的区域选择性。的如此显着加性效应Ñ卜4 NOAC通过分离和表征一些镍配合物,表现中性电荷的五配位η的关键作用阐明3与较早在烯丙基取代反应中报道的常见阳离子四配位复合物相反,本系统中的乙酸烯丙基乙酸酯络合物。
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
light-induced palladium-catalyzed homologative three-component synthesis of allylic amines has been developed. This protocol proceeds via a unique mechanism involving two distinct cycles enabled by the same Pd(0) catalyst: a visible light-induced hybrid radical alkyl Heck reaction between 1,1-dielectrophile and styrene, followed by the “in dark” classical Tsuji–Trost-type allylic substitution reaction. This
We present a novel strategy for the amination of various allylic acetate derivatives in continuous mode. The developed SILP-based method provides simple and rapid access to allylic amine derivatives, relies on mild conditions and environmentally benign solvents such as 2-methyltetrahydrofuran and heptane.