Unsaturated hydrocarbons can easily be prepared in a few seconds starting from 1,2 dibromides in the presence of a catalytic amount of Nickel diphenylphosphinoethane dichloride (NidppeCl2) and tri.n.butyl tin hydride, (TBTH) at room temperature. The dependencie of the nature of starting dihalides is investigated.
Compounds and compositions useful as antifungal and antimycobacterial
申请人:The University of Mississippi
公开号:US05227383A1
公开(公告)日:1993-07-13
New analogs of sampangine and cleistopholine, compositions and methods of preparation thereof, method of treating fungal and mycobacterial infections. The compounds have the general formula: ##STR1## where the R.sub.1, R.sub.2, and R.sub.5 groups are defined herein.
“Tailor-made” carbonylylides bearing only alkyl substituents or no substituents were efficiently generated from α-chloroalkyl α′-chloroalkyl ethers in the presence of samarium reagents. Using these novel and synthetically practical carbonylylides, optionally substituted and stereochemically defined tetrahydrofurans, dihydrofurans and dioxolane were synthesized in a single step.
Nickel mediated flash isomerization: A new approach to 1,4-but-1-ene diol derivatives
作者:Corrado Malanga、Andrea Urso、Luciano Lardicci
DOI:10.1016/0040-4039(94)02414-7
日期:1995.2
Fast isomerization of cis 1,4-but-2-endiol derivatives (1) to 1,4-but-1-endiol derivatives (2) was carried out in mild conditions. The activity of the proposed Ni-hydride species is closely correlated with the nature of the protecting groups of the alcoholic functions of 1, which are also responsible for the regio and stereo chemical aspects of the reaction.
Organolithium-Induced Alkylative Ring Opening of Aziridines: Synthesis of Unsaturated Amino Alcohols and Ethers
作者:David M. Hodgson、Bogdan Štefane、Timothy J. Miles、Jason Witherington
DOI:10.1021/jo0615201
日期:2006.10.1
Organolithium-induced alkylative ring opening of N-sulfonyl-protected aziridinyl ethers is described. The reactions were efficiently carried out with a variety of organolithiums, providing a promising new strategy to unsaturated aminoalcohols and ethers. Cis- and trans-1,4-dimethoxybut-2-ene-derived aziridines were prepared, and their propensity to undergo organolithium- induced alkylative desymmetrization