吲哚-2-甲酸乙酯 、
(2R,3S,4S)-3,4-dihydro-2-dimethoxymethyl-3,4-epoxy-2-methyl-6-nitro-2H-1-benzopyran 在
magnesium(II) perchlorate 作用下,
以
乙腈 为溶剂,
反应 6.0h,
生成 1-[(2R,3S,4R)-3,4-dihydro-2-dimethoxymethyl-3-hydroxy-2-methyl-6-nitro-2H-1-benzopyran-4-yl]-(2S)-2,3-dihydro-1H-indole-2-carboxylic acid ethyl ester 、
1-[(2R,3S,4R)-3,4-dihydro-2-dimethoxymethyl-3-hydroxy-2-methyl-6-nitro-2H-1-benzopyran-4-yl]-(2R)-2,3-dihydro-1H-indole-2-carboxylic acid ethyl ester