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.
A novel ketone olefination via organozinc reagents in the presence of diphenyl phosphite
作者:Hua Cui、Ying Li、Songlin Zhang
DOI:10.1039/c2ob06821d
日期:——
Carbonyl compounds react with organozinc reagents in the presence of diphenyl phosphite to give the corresponding olefins. A variety of 1,3-dienes and unsaturated esters were obtained in moderate to excellent yields under mild conditions.
An Example of Ketone Olefination via Praseodymium-Mediated Barbier Reaction in the Presence of Diethyl Phosphite
作者:Xu yan Cao、Fei Huang、Songlin Zhang
DOI:10.1055/s-0039-1690096
日期:2019.7
The first example of carbon double-bond formation via praseodymium-mediated Barbier type reaction of ketones and allyl halides in the presence of diethylphosphite is reported. The reaction is highly α-regioselective and conveniently carried out under mild conditions in a one-pot fashion. From a synthetic point of view, a series of conjugated alkenes were obtained in moderate to good yields in this
Cyclopropylmethyl Palladium Species from Carbene Migratory Insertion: New Routes to 1,3-Butadienes
作者:Lei Zhou、Fei Ye、Yan Zhang、Jianbo Wang
DOI:10.1021/ol2034405
日期:2012.2.3
Cyclopropylmethyl palladium species can be accessed by Pd-catalyzed reaction of either cyclopropyl N-tosylhydrazone with halide or N-tosylhydrazone with cyclopropyl halide. In both approaches migratory insertion of Pd carbene is the key process. These transformations constitute new approaches toward 1,3-butadiene derivatives.
Neodymium-Promoted Highly Selective Carbon–Carbon Double Bond Formation of Ketones with Allyl Halides in the Presence of Diethyl Phosphite
作者:Songlin Zhang、Dengbing Xie、Yiqiong Wang、Bo Yang
DOI:10.1055/s-0040-1707219
日期:2020.11
Abstract The carbon–carbon double bond formation via neodymium-mediated Barbier-type reaction of ketones and allyl halides in the presence of diethylphosphite is reported for the first time. The reaction is highly α-regioselective and was conveniently carried out under mild conditions in a one-pot fashion. From a synthetic point of view, a series of conjugated alkenes were obtained in moderate to