3β-hydroxylup-13(18)-ene 在
pyridinium chlorochromate absorbed on neutral alumina 作用下,
以
正己烷 为溶剂,
反应 16.0h,
以80 mg的产率得到(1S,3aR,5aS,5bR,7aR,11aR,11bR)-1-Isopropyl-3a,5a,5b,8,8,11a-hexamethyl-1,2,3,3a,4,5,5a,5b,6,7,7a,8,10,11,11a,11b,12,13-octadecahydro-cyclopenta[a]chrysen-9-one