Photochemical studies on exo-bicyclo[2.1.1]hexyl and bicyclo[3.1.0]hexyl aryl ketones: two approaches for synthesis of enantiomerically enriched cyclopentene derivatives
Two approaches for the photochemical synthesis of cyclopentene derivatives through the Norrish type II cleavage reaction were described. Asymmetric studies using ionic chiral auxiliaries afforded enantiomeric excesses of up to 98% at the conversion of 85%. The results were rationalized by single X-ray crystal structures.
Isomerisierungen und Umlagerungen in Bicyclischen Systemenvia cyclopropan-carbaldehyd-enamine
作者:Max Rey、Andr� S. Dreiding
DOI:10.1002/hlca.19740570327
日期:1974.4.27
The pyrrolidino-aminal (4) of bicyclo[3.1.0]hex-2-ene-6-endo-carbaldehyde (3) underwent a facile (80°), mildly acid catalyzed isomerization to the corresponding exo-aminal (6), which was characterized by hydrolysis to bicyclo[3.1.0]hex-2-ene-6-exo-carbaldehyde (7).