Journal
TETRAHEDRON
Volume 64, Issue 7, Pages 1536-1547Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2007.10.075
Keywords
diastereoselectivity; cyclopropanols; titanacyclopropanes; ate complexes
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Data on the stereochemistry of the intramolecular cyclization of beta-metaloketones into 1,2-disubstituted cyclopropanols are in agreement with the cyclopropanation of carboxylic esters with alkoxytitanacyclopropane reagents proceeding via the beta-titanoketone inter-mediates with the metal atom bound to a secondary carbon. Hypothesis for the origin of cis-diastereoselectivity of the cyclization of the beta-titanoketones is suggested. It explains the tendency for the preferable formation of cis-1,2-disubstituted cyclopropanols by relief of repulsion strain between the ligands at the octahedral titanium atom. (c) 2007 Published by Elsevier Ltd.
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