Selectivity in Rhodium(II)-Catalyzed Rearrangements of cycloprop-2-ene-1-carboxylates
作者:Paul Müller、Christian Gränicher
DOI:10.1002/hlca.19950780113
日期:1995.2.8
substituents of the cyclopropene ring. Product composition is markedly influenced by the number, nature, and position of the substituents, which determine the regio- and stereoselectivity of the cyclopropene-ring cleavage. A mechanism is proposed in which attack of the electrophilic RhII species is concerted with disrotatoryringopening of the incipient cyclopropyl cation and affords a metal-complexed
Borylated Cyclopropanes as Spring-Loaded Entities: Access to Vicinal Tertiary and Quaternary Carbon Stereocenters in Acyclic Systems
作者:André U. Augustin、Sergio Di Silvio、Ilan Marek
DOI:10.1021/jacs.2c07394
日期:2022.9.14
formation of acyclic frameworks bearing two consecutive stereocenters of either tertiary or quaternary nature starting from easily accessible cyclopropenes. This holistic approach involves a regio- and diastereoselective hydro- or carboborylation of substituted cyclopropenyl esters. Formation of boronate complexes of the latter via the addition of nucleophiles and subsequent stereospecific 1,2-migration