Cleavage of Activated Cyclic Amines: Unprecedented Approach toward 2-Substituted Cyclobutanones
作者:Sivaraj Baktharaman、Sermadurai Selvakumar、Vinod K. Singh
DOI:10.1021/ol0616687
日期:2006.9
We report, for the first time, ringopening of activated four- to six-membered cyclic amines followed by an intramolecular expansion of cyclopropanol to cyclobutanone via carbocation intermediate. In the case of a N-tosylaziridine ester, a cyclobutanol was formed in a stereospecific manner during the Kulinkovich reaction step.
Novel chiral dirhodium catalysts derived from aziridine and azetidine carboxylic acid for intermolecular cyclopropanation reactions with methyl phenyldiazoacetate
Three new chiraldirhodium(II) tetracarboxylate catalysts, based on azetidine- and aziridine-2-carboxylic acid, were prepared. Their selectivities in the cyclopropanationreaction of methylphenyldiazoacetate and olefins were determined in solvents of decreasing polarity and compared with those obtained with proline derived catalysts.