Carbonyl transposition on organoselenium compounds
作者:João V. Comasseto、Wai L. Lo、Nicola Petragnani
DOI:10.1016/s0040-4020(97)00454-7
日期:1997.6
Carbonyl conjugated vinylic selenides undergo 1,3 and 1,5-carbonyl transposition sequences through organometallic reagents addition reactions followed by acid hydrolysis.
羰基共轭乙烯基硒化物通过有机金属试剂加成反应进行1,3和1,5-羰基转座序列,然后进行酸水解。
β-Phenylseone α,β-Unsaturated Aldehydes, Efficient Three Carbon Homologating Agents. 1,3-Carbonyl Transposition
作者:Elena P. Arrua、João V. Comasseto
DOI:10.1080/00397919108021067
日期:1991.8
Abstract The easily obtained β-phenylseleno α,β-unsaturated aldehydes react with Grignardreagents and with n-butyllithium leading to the 1,2-addition products, which upon acidic hydrolysis in the presence of silica gel afford the selenium-free α,β-unsaturated carbonyl compounds with 1,3-carbonyl transposition.
A general and efficient synthesis of allenes using a palladium(0)/diethylzinc system is described. Treatment of mesylates or trichloroacetates of (E)- or (Z)-2-bromoalk-2-en-1-ols with diethylzinc in the presence of a catalytic amount of palladium(0) affords allenes bearing an aminoalkyl, alkyl, or aryl substituent(s) in good to high yields. No transfer of chirality from the stereogenic center carrying