Rhodium-Catalyzed Cyclopropanation of Alkenes with Dimethyl Diazomalonate
作者:Francisco González-Bobes、Michaël D. B. Fenster、Susanne Kiau、Laxma Kolla、Sergei Kolotuchin、Maxime Soumeillant
DOI:10.1002/adsc.200800027
日期:2008.4.7
α′-tetramethyl-1,3-benzenedipropanoate] to catalyze the cyclopropanation of a wide range of alkenes with malonate-derived carbenoids under mild reaction conditions is reported in this communication. The experimental protocol is remarkably simple, uses readily accessible and stable dimethyldiazomalonate with very low catalyst loading. More importantly, the alkene is employed as a limiting reagent.
Rhodium-catalyzed heterocycloaddition route to 1,3-oxazoles as building blocks in natural products synthesis
作者:Richard D. Connell、Mark Tebbe、Anthony R. Gangloff、Paul Helquist、Björn Åkermark
DOI:10.1016/s0040-4020(01)87261-6
日期:——
Rhodium(II) acetate serves as a catalyst for the heterocycloaddition reaction of diazodicarbonyl compounds with nitriles to give functionalized 1,3-oxazole derivatives in a simple one-step procedure. In particular, dimethyl diazomalonate undergoes this reaction to give 2-aryl-, 2-alkenyl-, or 2-alkyl-4-carbomethoxy-5-methoxy-1,3-oxazoles, and ethyl formyldiazoacetate (diazomalonate half-ester half-aldehyde)
Organophotocatalytic carbo-heterofunctionalization of unactivated olefins with pendant nucleophiles
作者:David M. Fischer、Manuel Freis、Willi M. Amberg、Henry Lindner、Erick M. Carreira
DOI:10.1039/d3sc02250a
日期:——
The difunctionalization of unactivated, terminal olefins through intermolecular addition of α-bromoketones, -esters, and -nitriles followed by formation of 4- to 6-membered heterocycles with pendant nucleophiles is reported.