(2E)-2-(1-{1-[4-(dimethylamino)phenyl]-5-methoxy-2-methyl-1H-indol-3-yl}ethylidene)-3-(1-methylethylidene)butanedioic acid 在
乙酸酐 作用下,
以91%的产率得到(3E)-3-(1-{1-[4-(dimethylamino)phenyl]-5-methoxy-2-methyl-1H-indol-3-yl}ethylidene)-4-(1-methylethylidene)tetrahydro-2,5-furandione