The products and stereochemistries of carbenic decompositions of varied 2-aryl-1-diazoalkanes and 1-diazo-2-(2-hetaryl)propanes have been determined.
已经确定了各种2-芳基-1-重氮烷和1-重氮-2-(2-杂芳基)丙烷的羧基分解产物和立体化学。
Silylium-Ion-Promoted Ring-Opening Hydrosilylation and Disilylation of Unactivated Cyclopropanes
作者:Avijit Roy、Vittorio Bonetti、Guoqiang Wang、Qian Wu、Hendrik F. T. Klare、Martin Oestreich
DOI:10.1021/acs.orglett.0c00173
日期:2020.2.7
hydrosilylation of unactivated cyclopropanes is reported. The reaction is facilitated by the γ-silicon effect, and the regioselectivity is influenced by various stabilizing effects on the carbenium-ion intermediates, including the β-silicon effect. The experimental observations are in accord with the computed reaction mechanism. The work also showcases the ability of silylium ions to isomerize cyclopropyl to allyl
Lanthanum metal-assisted cyclopropanation of alkenes with gem-dihaloalkanes
作者:Yutaka Nishiyama、Hana Tanimizu、Tsuyoshi Tomita
DOI:10.1016/j.tetlet.2007.06.168
日期:2007.9
It was confirmed that lanthanum metal was an efficient reagent for the reductivedehalogenation of gem-dihaloalkanes. When gem-dihaloalkanes were allowed to react with lanthanum metal in the presence of alkenes, cyclopropanation of the alkenes occurred under mild conditions giving the corresponding cyclopropanes in moderate to good yields.
作者:Abolghasem (Gus) Bakhoda、Quan Jiang、Yosra M. Badiei、Jeffery A. Bertke、Thomas R. Cundari、Timothy H. Warren
DOI:10.1002/anie.201810556
日期:2019.3.11
functionalizing stronger primary and secondary C−H bonds over tertiary and benzylic C−H sites. Herein, we report a Cu catalyst that exhibits a high degree of primary and secondary over tertiary C−H bond selectivity in the amidation of linear and cyclic hydrocarbons with aroyl azides ArC(O)N3. Mechanistic and DFT studies indicate that C−H amidation involves H‐atom abstraction from R‐H substrates by nitrene intermediates
Synergistic effect of additives on cyclopropanation of olefins
作者:Donghao Cheng、Deshun Huang、Yian Shi
DOI:10.1039/c3ob40751a
日期:——
An efficient cyclopropanation of olefins with Zn(CH2I)2, a catalytic amount of CCl3CO2H, and 1,2-dimethoxyethane at room temperature is described. A wide variety of olefins, including acid-sensitive substrates, can be cyclopropanated in 71–99% yield.