(4R,4 aR,8aS)-methyl-4-(4-fluorophenyl)-8 a-hydroxy-4 a-nitro-4a,5,6,7,8,8 a-hexahydro-4H-chromene-2-carboxylate 在
四丁基氟化铵 作用下,
以
四氢呋喃 为溶剂,
反应 4.0h,
以61%的产率得到(7S,8R,Z)-methyl 8-(4-fluorophenyl)-7-nitro-2-oxo-3,4,5,6,7,8-hexahydro-2H-oxecine-10-carboxylate