A novel and efficient method for the olefination of carbonyl compounds with Grignard reagents in the presence of diethyl phosphite
作者:Tongqiang Wang、Yuanyuan Hu、Songlin Zhang
DOI:10.1039/c001931c
日期:——
The widely available carbonyl compounds react with Grignardreagents in the presence of diethyl phosphite to give the corresponding olefins in good to excellent yields: A range of conjugated dienes, terminal olefins, multisubstituted-alkenes and conjugated enynes could be readily obtained by the method in mild conditions.
Palladium-Catalyzed Oxidative Cross-Coupling of N-Tosylhydrazones or Diazoesters with Terminal Alkynes: A Route to Conjugated Enynes
作者:Lei Zhou、Fei Ye、Jiachen Ma、Yan Zhang、Jianbo Wang
DOI:10.1002/anie.201007224
日期:2011.4.4
Coming at them from another angle: In a fresh approach to the synthesis of conjugatedalkynes, the palladium‐catalyzed cross‐coupling of N‐tosylhydrazones or diazoesters with terminalalkynes provided the desired enyne products with excellent stereoselectivity (see scheme; Ts=p‐toluenesulfonyl). The reaction is proposed to involve an unprecedented alkynyl migratory insertion of a palladium carbene
从另一个角度出发:在一种新颖的共轭炔烃合成方法中,钯催化的N-甲苯磺酰hydr或重氮酸酯与末端炔烃的交叉偶联为所需的烯炔产物提供了出色的立体选择性(参见方案; Ts = p ‐甲苯磺酰基)。提出该反应涉及钯卡宾络合物的前所未有的炔基迁移插入。
The First Heck Reactions with 1-Chloroalk-1-ynes: Syntheses of Enynes with Isolatedand Conjugated p-Systems
The Heck reaction between 1-chloro-2-phenylacetylene and cycloalkenes or cycloalkadienes affords phenylethynyl substituted cycloalkenes as regular Heck products as well as 1,3-diphenylprop-2-ynylidene and (cycloalkenyl)phenylmethylidene substituted bicyclic compounds as tandem products by reaction of ClC=CPh and the cycloalkene in a ratio of 1:2 and 2:1, respectively.