E,(7S)-N-{(2Z)-(chloromethylene)-4,6-dioxo-6-[(5R)-(tert-butyldimethylsilyloxymethyl)-4-methoxy-2-oxo-1H-pyrrol-1(5H)-yl]hexyl}-7-methoxy-N'-methyltetradec-4-enamide 、
原甲酸三甲酯 在
硫酸 作用下,
以
甲醇 为溶剂,
反应 30.0h,
以53%的产率得到E,(7S)-N-{(2Z,4E)-2-(chloromethylene)-4-methoxy-6-oxo-[(5R)-hydroxymethyl-4-methoxy-2-oxo-1H-pyrrol-1(5H)-yl]-4-hexenyl}-7-methoxy-N.-methyltetradec-4-enamide