trimethylsilyl enol ether of 4-methoxyacetophenone 、 (3S,5S,6R)-4-(benzyloxycarbonyl)-3-bromo-5,6-diphenyl-2,3,5,6-tetrahydro-4H-1,4-oxazin-2-one 在
zinc(II) chloride 作用下,
以
四氢呋喃 、
乙腈 为溶剂,
反应 4.0h,
生成 (3R,5S,6R)-4-(benzyloxycarbonyl)-5,6-diphenyl-3-<2'-oxo-2'-(4"-methoxyphenyl)ethyl>-2,3,5,6-tetrahydro-4H-1,4-oxazin-2-one 、 (3S,5S,6R)-4-(benzyloxycarbonyl)-5,6-diphenyl-3-<2'-oxo-2'-(4"-methoxyphenyl)ethyl>-2,3,5,6-tetrahydro-4H-1,4-oxazin-2-one