Regioselective hydroxylation in the B ring of ent-kaurene; syntheses of ent-7β- and 9α-hydroxykaur-16-enes
Abstract
Regioselective hydroxylation at the C-7 and the C-9 position of ent-kaur-16-ene (2) was achieved via radical cyclization of a hydroxymethyl group introduced at the C-15 position followed by removal of the carbon atom at C-15.