Ligand Controlled Highly Selective Copper-Catalyzed Borylcuprations of Allenes with Bis(pinacolato)diboron
作者:Weiming Yuan、Shengming Ma
DOI:10.1002/adsc.201100929
日期:2012.7.9
Copper‐catalyzed highlyselectiveborylcuprations of allenes with bis(pinacolato)diboron produce two different types of alkenylboranes by applying a ligand effect. In the presence of tris(para‐methoxyphenyl)phosphine [P(C6H4OMe‐p)3], the reaction of aryl‐1,2‐dienes affords 2‐alken‐2‐yl boronates as the only product with exclusive Z‐geometry; the regioselectivity is switched to afford the 1‐alken‐2‐yl
铜催化的具有双(频哪醇)二硼烷的丙二烯的高选择性硼烷基cup通过施加配体效应产生两种不同类型的烯基硼烷。在存在三(对-甲氧基苯基)膦[P(C 6 H 4 OMe- p)3 ]的情况下,芳基1,2-二烯的反应提供2-烯丙基-2-基硼酸酯作为唯一的独家产品Z几何 当使用二齿膦2,2'-双(二苯基膦基)联苯作为配体时,区域选择性切换为主要产物1-烯丙基-2-基硼酸酯。
Copper(<scp>ii</scp>)-catalyzed protoboration of allenes in aqueous media and open air
作者:Russell F. Snead、Jan Nekvinda、Webster L. Santos
DOI:10.1039/d0nj02010a
日期:——
A method has been developed for the facile Cu(II)-catalyzed protoboration of monosubstituted allenes in aqueous media under atmospheric conditions. The reaction occurs site selectively, favoring internal alkene protoboration to afford 1,1-disubstituted vinylboronic acid derivatives (up to 93 : 7) with modest to good yields. The method has been applied to a variety of phenylallene derivatives as well