Site-selective hydroxylation of steroids via oxometalloporphinates covalently linked to ring D: introduction of hydroxyl groups into the C(9) and C(12) position of 5.alpha.-androstanes
摘要:
Oxidation of synthetic manganese(III) porphyrins attached to steroidal substrates at C(17) (cf. 2 and 3) gives rise to hydrogen atom abstraction at C(9) and/or C(12), thereby leading to hydroxyl incorporation at these sites. The use of more robust metalloporphyrins (cf. 9) results in substantial increases in the yields of hydroxylated 5-alpha-androstanes.