Stereochemical Aspects of Acid-Catalyzed Cyclopropane Ring-Opening Reactions. A Stereospecific Pathway to Crinosterol and Brassicasterol
作者:Robert W. Lang、Carl Djerassi
DOI:10.1002/hlca.19820650144
日期:1982.2.3
acetic acid leads stereospecifically to the naturally occurring crinosterol (4) and brassicasterol (6), respectively (Scheme 1). This isomerization can be viewed as a biomimetic model of an in vivo methylation process of the type already known in plant sterol metabolism (cf. cycloeucalenol obtusifoliol, 1 2). The synthetic application of this method provides a convenient labelling of sterol side chains