Hydrozirconation of alkenyloxirane derivatives: Preparation of cycloalkylmethanols
摘要:
Cyclopentyl and cyclopropylmethanol derivatives were efficiently prepared through a chemoselective hydrozirconation reaction of (1-butenyl)oxirane and vinyloxirane with Cp2ZrHCl. However, the attemped reaction of (1-pentenyl)oxirane or (1-propenyl)oxirane failed to yield cyclohexyl or cyclobutylmethanols. The ring formation was stereospecific and proceeded with the inversion of the configuration at the reacting oxirane carbon. The origin of stereospecificity and the stereoselectivity in the formation of cyclopropylmethanols was presumed by the approach of the Schwartz reagent from the less hindered site of the stable gauche-conformer of the vinyloxirane compound in the transition state. (Cyclopropylmethyl)amine derivatives were also prepared by the treatment of vinylaziridine derivatives with Cp2ZrHCl. (C) 1997 Elsevier Science Ltd. All rights reserved.
Competitive intramolecular cyclizations of epoxides to aromatic and double bond positions
作者:Stephen K. Taylor、David S. Bischoff、Curtis L. Blankespoor、Paul A. Deck、Suzanne M. Harvey、Patricia L. Johnson、Ariane E. Marolewski、Steven W. Mork、Douglas H. Motry、Ronald Van Eenenaam
DOI:10.1021/jo00300a046
日期:1990.6
TAYLOR, STEPHEN K.;BISCHOFF, DAVID S.;BLANKESPOOR, CURTIS L.;DECK, PAUL A+, J. ORG. CHEM., 55,(1990) N3, C. 4202-4207
作者:TAYLOR, STEPHEN K.、BISCHOFF, DAVID S.、BLANKESPOOR, CURTIS L.、DECK, PAUL A+