Les amines et lessulfes de β-malonyl allyle se cyclisent en存在 de四氯钯酸盐锂 et d'une base pour donner des palladocycles bicycliques qui conduisent aux cyclopentanes par氢化。关于peut ainsi preparer une serie de cetones cycliques
functionalized allylic gem‐difluorides via catalytic fluorinative Meyer–Schuster‐like rearrangement is disclosed. This transformation proceeded with readily accessible propargylicfluorides, and low‐cost B–F reagents and electrophilic reagents by sulfide catalysis. A series of iodinated, brominated, and trifluoromethylthiolated allylic gem‐difluorides that were difficult to access by other methods were
Catalytic Anti-Markovnikov Hydroallylation of Terminal and Functionalized Internal Alkynes: Synthesis of Skipped Dienes and Trisubstituted Alkenes
作者:Melrose Mailig、Avijit Hazra、Megan K. Armstrong、Gojko Lalic
DOI:10.1021/jacs.7b02104
日期:2017.5.24
and functionalized internal alkynes. In this article, we describe the development of the reaction, exploration of the substrate scope, and a study of the reaction mechanism. Synthesis of skipped dienes through the hydroallylation of terminal alkyl and aryl alkynes with simple allyl phosphates and 2-substituted allyl phosphates is described. The hydroallylation of functionalized internal alkynes leads
Stereoselective Synthesis of Exocyclic Tetrasubstituted Vinyl Halides via Ru-Catalyzed Halotropic Cycloisomerization of 1,6-Haloenynes
作者:Barry M. Trost、Christopher A. Kalnmals
DOI:10.1021/acs.orglett.7b00879
日期:2017.5.5
Herein, a ruthenium-catalyzed cycloisomerization that transforms 1,6-haloenynes into 5-membered carbo- and heterocycles that bear exocyclic, stereodefined, tetrasubstituted vinylhalides is reported. The reaction is insensitive to air and water, tolerates a variety of functional groups, and proceeds with good to excellent stereoselectivity and yield.
The first catalytic enantioselective allylic substitution reaction with alkylboron compounds has been achieved. The reaction between alkyl-9-BBN reagents and primary allylic chlorides proceeded with excellent γ-selectivities and high enantioselectivities under catalysis of a Cu(I)-DTBM-SEGPHOS system. The protocol produces terminal alkenes with an allylic stereogenic center branched with functionalized
申请人:SHELL INTERNATIONALE RESEARCH
MAATSCHAPPIJ B.V.
公开号:EP0444742A1
公开(公告)日:1991-09-04
A process for preparing an ester of the formula
R¹-O-CO-R²
wherein R¹ is an alkenyl group and R² is an alkyl, alkenyl or alkynyl group, which comprises reacting the corresponding halide of formula R¹Hal with the corresponding alkali metal acylate of the formula MOCOR², in the presence of an inert aprotic solvent and a phase-transfer catalyst, optionally followed by hydrolysis of the ester into the corresponding alcohol.