A Novel Stereospecific Synthesis of 22-Hydroxylated Triterpenes and Steroids: Syntheses of 22<i>R</i>-Hydroxylanosterol and 22<i>R</i>-Hydroxydesmosterol
作者:Alain Amann、Guy Ourisson、Bang Luu
DOI:10.1055/s-1987-28048
日期:——
22R-Hydroxylanosterol (10) is prepared from lanosterol (1) with an overall yield of over 30%. The key step of the synthesis is the stereospecific coupling of the aldehyde 7 with an arsenic ylide. The same reaction is used to build the side chain of 22R-hydroxydesmosterol (14).