methyl 2'-{[(E)-3β-acetoxyandrost-5-en-17-ylidene]methyl}-(4'R)-4',5'-dihydro-1',3'-oxazole-4'-carboxylate 在
cholesterol esterase 、
sodium cholate 作用下,
以
aq. phosphate buffer 为溶剂,
反应 14.0h,
以50%的产率得到methyl (4′R)-2′-{[(E)-3β-hydroxyandrost-5-en-17-ylidene]methyl}-4′,5′-dihydro-1′,3′-oxazole-4′-carboxylate