Synthesis of DPPP- and DPPPEN-Type Bidentate Ligands by Ring-Opening Diphosphination of Methylene- and Vinylcyclopropanes under Visible-Light-Promoted Photoredox Catalysis
A ring-opening diphosphination of methylene- and vinylcyclopropanes with tetraaryldiphosphines (Ar2P-PAr2) has been developed to afford the corresponding 1,3-diphenylphosphinopropane- and 1,3-diphenylphosphinopentane-type bidentate ligands, respectively. The reaction proceeds under bromine cation-initiated, visible-light-promoted photoredox catalysis at ambient temperature. Owing to the ready availability
Direct Synthesis of Methylene-1,2-dichalcogenolanes via Radical [3 + 2] Cycloaddition of Methylenecyclopropanes with Elemental Chalcogens
作者:Lei Yu、Yulan Wu、Tian Chen、Yi Pan、Qing Xu
DOI:10.1021/ol3031846
日期:2013.1.4
Direct [3 + 2] radical cycloaddition of methylenecyclopropanes and elemental chalcogens (S, Se, Te) can readily occur under simple thermal conditions, providing an efficient, practical method for preparation of useful but not easily accessed methylene-1,2-dichalcogenolanes.
A palladium-catalyzed ring-opening bis(alkoxycarbonylation) reaction of methylenecyclopropanes in the presence of copper(I) salt was achieved under normal pressure of carbon monoxide and oxygen to give the corresponding α-methyleneglutarates.
Electrochemical oxidative C–C bond cleavage of methylenecyclopropanes with alcohols
作者:Rakesh Kumar、Shiv Dutt、Prabal Banerjee
DOI:10.1039/d4cc00843j
日期:——
ring opening functionalization of methylenecyclopropanes (MCPs) via C–Cbondcleavage in the presence of alcohols is reported. The methodology avoids the usage of external oxidants and shows good functional group tolerance. The mechanistic studies suggest that the reaction proceeds via direct single electron oxidation of the C–Cbond of MCPs followed by ring opening to form the desired product.