Pent-4-enoic acid (2R,3R,4R,5S,6R)-4,5-diacetoxy-6-acetoxymethyl-3-pent-4-enoylamino-tetrahydro-pyran-2-yl ester 在
W(O-2,6-C6H3Cl2)2Cl4 、
四正丁基铅 作用下,
以
氯苯 为溶剂,
以56%的产率得到Acetic acid (E)-(2R,3S,4R,4aR,14aS)-3-acetoxy-2-acetoxymethyl-6,13-dioxo-3,4,4a,6,7,8,11,12,13,14a-decahydro-2H,5H-1,14-dioxa-5-aza-benzocyclododecen-4-yl ester