Acetic acid 10-chlorooxalyl-6,7,8,9-tetrahydro-pyrido[1,2-a]indol-8-ylmethyl ester 、 1-Methyl3-indoleacetimidate hydrochloride 以to give 3-[8-(acetoxymethyl)-6,7,8,9-tetrahydropyrido[1,2-a]indol- 10-yl ]-4-(1-methyl-3-indolyl)- 1H-pyrrole-2,5-dione的产率得到(S)-3-[8-(acetoxymethyl)-6,7,8,9tetrahydropyrido[1,2-a ]indol-10-yl ]-4-(1-methyl-3-indolyl)-1H-pyrrole-2,5-dione