Phlebicsaeure A-methylester 在
吡啶 、
chromium(VI) oxide 、 lithium aluminium tetrahydride 作用下,
以
乙醚 为溶剂,
生成 (3S,3aS,5aR,5bR,7aR,8R,11aR,11bR,13aS,13bR)-13b-Hydroxymethyl-3-(1-hydroxy-1-methyl-ethyl)-5a,5b,8,11a-tetramethyl-icosahydro-cyclopenta[a]chrysene-8-carbaldehyde