The Effects of Lewis Acid on the 1,3-Dipolar Cycloaddition Reaction of C-Arylaldonitrones with Alkenes.
作者:Tomio Shimizu、Masaya Ishizaki、Nobuo Nitada
DOI:10.1248/cpb.50.908
日期:——
The regio- and stereoselectivity of the 1,3-dipolarcycloaddition reactions of C-aryl-N-alkylaldonitrones (1a-e) with somealkenes were found to be affected significantly by the addition of Lewis acid. The rate of the reaction was also affected by adding the Lewis acid. In the reactions using allyl alcohol as a dipolarophile an addition of Lewis acid caused a remarkable acceleration of the reaction
Reduction of 2,3-Dihydroisoxazoles to β-Amino Ketones and β-Amino Alcohols
作者:Patrick Aschwanden、Lisbet Kværnø、Roger W. Geisser、Florian Kleinbeck、Erick M. Carreira
DOI:10.1021/ol052540c
日期:2005.12.1
[chemical reaction: see text]. We report the reduction of 2,3-dihydroisoxazoles to beta-amino ketones and beta-amino alcohols. The latter are obtained in high diastereoselectivity with preference for the syn isomer.