Identification of a Fossil Sterane Biomarker in Crude Oil - an Androstane with a Modified Carbon Skeleton
作者:Matthias Bender、Marc Schmidtmann、Jürgen Rullkötter、Roger E. Summons、Jens Christoffers
DOI:10.1002/ejoc.201300788
日期:2013.9
of four stereoisomers of 3-methyl-A-nor-androstane (4 % overall yield) was prepared by ionic hydrogenation of the olefin after A-ring recyclization in three steps. 17-Methyl-18-nor-androstane was synthesized in four steps as a mixture of isomers (58 % overall yield) from dihydrotestosterone with a Wagner–Meerwein shift of the 13β-methyl group to C-17 as the key step. Pure 17β- and 17α-methyl-18-nor-13α-androstane