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。
Direct Allylic Amination of Allylic Alcohol Catalyzed by Palladium Complex Bearing Phosphine–Borane Ligand
The direct electrophilic, nucleophilic, and amphiphilic allylations of allylic alcohol by use of a palladium catalyst and organometallic reagents such as organoborane and organozinc has been developed. The phosphine–borane compound works as the effective ligand for palladium-catalyzed direct allylic amination of allylic alcohol. Thus, with secondary amines, the reaction was completed in only 1 h, even
Allylic alcohols caused allylic amination with primary or secondary amines in the presence of a catalytic amount of Pd(PPh3)4 and a stoichiometric amount of tin(II) chloride in THF at 50 °C to produce the corresponding allylic amines regioselectively.
在催化量的 Pd(PPh3)4 和化学计量量的氯化锡 (II) 的 THF 中,在 50 °C 下,烯丙醇与伯胺或仲胺发生烯丙胺化反应,以区域选择性地产生相应的烯丙胺。
SUBSTITUTED INTERNAL VINYL-BORONIC ACIDS AND BORONIC ACID DERIVATIVES
申请人:Math Shivanand K.
公开号:US20120041193A1
公开(公告)日:2012-02-16
Disclosed herein are vinyl-bromides, vinyl-boronic acids and vinyl-boronic acid derivatives useful as synthetic intermediates for the preparation of therapeutic agents. Also disclosed are methods of synthesis of vinyl-bromides, vinyl-boronic acids and vinyl-boronic acid derivatives.
Enantioselective Ring-Closing Aminomethylamination of Allylic Aminodienes with Aminals Triggered by C–N Bond Metathesis
作者:Suchen Zou、Zeyu Zhao、Hanmin Huang
DOI:10.1021/acs.orglett.4c00641
日期:2024.3.29
conceptually novel strategy utilizing a cyclopalladated complex as an electrophile to activate the C–N bond for the C–N bond metathesis between allylamines and aminals is developed, which enables an efficient ring-closing aminomethylamination of allylic aminodienes and aminals. The reaction proceeds under mild reaction conditions and displays a remarkable scope. Utilizing a modified Trost-type diphosphine