Stereoselective reactions. VII. Synthesis of racemic and optically pure stegane, isostegane, picrostegane, and isopicrostegane via highly selective isomerization.

Abstract

Novel isomerizations of isostegane (6) into the three other possible isomers, namely, isopicrostegane (7), picrostegane (8), and stegane (9) are described. All the possible enantiomers were synthesized.