(S)-2-tert-Butoxycarbonylamino-3-methyl-butyric acid (3aR,6aR,7aS,8S,11aS,11bS,11cS)-2-methoxy-3,8,11a,11c-tetramethyl-1,5,11-trioxo-1,3a,4,5,6a,7,7a,8,11,11a,11b,11c-dodecahydro-6-oxa-benzo[de]anthracen-10-yl ester 在
sodium tetrahydroborate 作用下,
以
乙醇 、
氯仿 为溶剂,
以66%的产率得到(S)-2-tert-Butoxycarbonylamino-3-methyl-butyric acid (3aR,6aR,7aS,8S,11aS,11bS,11cS)-5-hydroxy-2-methoxy-3,8,11a,11c-tetramethyl-1,11-dioxo-1,3a,4,5,6a,7,7a,8,11,11a,11b,11c-dodecahydro-6-oxa-benzo[de]anthracen-10-yl ester