24-Tosyloxy-3β-hydroxy-Δ12-oleanen-30-saeure-methylester 在
lithium aluminium tetrahydride 作用下,
以
四氢呋喃 为溶剂,
生成 (3S,4S,4aR,6aR,6bS,8aS,11R,12aR,14aR,14bR)-4,11-Bis-hydroxymethyl-4,6a,6b,8a,11,14b-hexamethyl-1,2,3,4,4a,5,6,6a,6b,7,8,8a,9,10,11,12,12a,14,14a,14b-icosahydro-picen-3-ol