(-)-(S)-tert-butyl 1-(1-(ethoxycarbonyl)prop-2-en-2-yl)-2-oxocyclohexane-carboxylate 在
sodium tetrahydroborate 、 calcium chloride 作用下,
以
甲醇 为溶剂,
反应 4.0h,
生成 (4aS,8aS)-tert-butyl 4a,5,6,7,8,8a-hexahydro-4-methyl-2-oxo-2H-chromene-4a-carboxylate 、 (4aS,8aR)-tert-butyl4a,5,6,7,8,8a-hexahydro-4-methyl-2-oxo-2H-chromene-4a-carboxylate 、
(4aR,8aS)-tert-butyl-4a,5,6,7,8,8a-hexahydro-4-methyl-2-oxo-2H-chromene-4a-carboxylate 、
(4aR,8aR)-tert-butyl 4a,5,6,7,8,8a-hexahydro-4-methyl-2-oxo-2H-chromene-4a-carboxylate