Chloroprene as a Source of Fine Chemicals: Palladium-Catalyzed Synthesis of Terminal Allenes
摘要:
[GRAPHICS]Several functionalized terminal allenes were prepared in moderate to excellent yield by a palladium-catalyzed reaction of chloroprene (2-chloro-1,3-butadiene) with soft nucleophiles.
Gold(I)-catalyzed intermolecular hydroarylation of allenes with nucleophilic arenes: scope and limitations
作者:Michael A. Tarselli、Ann Liu、Michel R. Gagné
DOI:10.1016/j.tet.2008.10.110
日期:2009.2
The addition of nucleophilic methoxyarenes to allenes proceeds at room temperature in dichloromethane with a catalytic amount of phosphite-gold(I) precatalyst and silver additive. The addition is regioselective for the allene terminus, and generates E-allylation products without the need for prefunctionalization of the synthons as organometallics or allyl bromides. Coordinating heteroaromatics and
Palladium-Catalyzed Approach to Stereodefined Ten-Membered Cycles from 1,5-Bisallenes
作者:Jiajia Cheng、Xuefeng Jiang、Shengming Ma
DOI:10.1021/ol202074e
日期:2011.10.7
A three-component Pd(0)-catalyzed reaction of 1,5-bisallenes with organic halides in the presence of primary amines was observed to afford stereodefined not readily available ten-membered cyclic compoundshighlychemo- and regioselectively. A mechanism involving two π-allylic palladium intermediates was proposed to account for the observed regio- and stereoselectivity.
The [2+2]-Cycloaddition Reaction of Bisallenes: A Dramatic Substituent Effect
作者:Ping Lu、Shengming Ma
DOI:10.1002/cjoc.201090271
日期:2010.9
bisallenes 1 possessing a phenylsulfonyl or n‐butyl substituent at the internal position of allene moieties could be smoothly transformed to the bicyclo[5.2.0] or bicyclo[6.2.0] derivatives 2 in moderate to excellent yields with good regioselectivity upon refluxing in toluene. This [2+2]‐cycloaddition reaction shows an interesting substituenteffect as unveiled by comparing with the results of unsubstituted
[GRAPHICS]Several functionalized terminal allenes were prepared in moderate to excellent yield by a palladium-catalyzed reaction of chloroprene (2-chloro-1,3-butadiene) with soft nucleophiles.
What Can a Metal Catalyst Do with Allenes? One-Step Formation of Steroid Scaffolds from Readily Available Starting Materials
作者:Shengming Ma、Ping Lu、Lianghua Lu、Hairong Hou、Jiemin Wei、Qiwen He、Zhenhua Gu、Xuefeng Jiang、Xing Jin