(E)-1-methyl 3-[2-(2-nitrovinyl)phenyl] 2-methylmalonate 在
(S)-1-[3,5-双(三氟甲基)苯基]-3-[1-(二甲基氨基)-3-甲基丁烷-2-基]硫脲 作用下,
以
甲苯 为溶剂,
反应 216.0h,
生成 (3R,4S)-methyl 3-methyl-4-(nitromethyl)-2-oxochroman-3-carboxylate 、
(3S,4R)-methyl 3-methyl-4-(nitromethyl)-2-oxochroman-3-carboxylate 、 (+/-)-(3R,4R)-methyl 3-methyl-4-(nitromethyl)-2-oxochroman-3-carboxylate