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。
Highly Selective Copper-Catalyzed Hydroboration of Allenes and 1,3-Dienes
The highlyselective copper‐catalyzed hydroboration of allenes has been developed. Allylboranes and alkenylboranes were selectively prepared by the judicious choice of catalytic species (copper hydride and boryl copper). Furthermore, two types of alkenylboranes could be selectively synthesized by the choice of an appropriate ligand. Mechanistic studies confirmed that the protonation of a (Z)‐σ‐allyl
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