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
Recyclable heterogeneous metal foil-catalyzed cyclopropenation of alkynes and diazoacetates under solvent-free mechanochemical reaction conditions
作者:Longrui Chen、Devonna Leslie、Michael G. Coleman、James Mack
DOI:10.1039/c8sc00443a
日期:——
cyclopropenation of terminal and internal alkynes under mechanochemical reactionconditions. This methodology enables the functionalization of a wide range of terminal or internal alkynes under ambient, aerobic, and solvent-freeconditions. Finally, we have demonstrated a unique and versatile one-pot domino Sonogashira-cyclopropenation mechanochemical reaction for the formation of complex cyclopropenes.
Zn(II)- or Rh(I)-Catalyzed Rearrangement of Silylated [1,1′-Bi(cyclopropan)]-2′-en-1-ols
作者:Hang Zhang、Changkun Li、Guojun Xie、Bo Wang、Yan Zhang、Jianbo Wang
DOI:10.1021/jo5010923
日期:2014.7.3
The rearrangement reactions of silylated alcohols bearing the highly strained structures of cyclopropene and cyclopropanol connected in adjacent positions have been studied under ZnI2- and Rh(I)-catalyzed conditions. The results show intriguing carbon skeletal reorganizations of such system under these conditions. The ZnI2-catalyzed reaction proceeds with C–O cleavage and the rearrangement of the resultant