3-chloro-6-oxo-5,6,7,8-tetrahydro-1,4-naphtoquinone 1,2-ethanediyl acetal 、
4-Methoxy-5-methylpyrano<4,3-b>indole-1,3(4H,5H)-dione 在
sodium hydride 作用下,
以56%的产率得到10,10-Ethylenedioxy-13-hydroxy-6-methoxy-5-methyl-8,9,10,11-tetrahydro-5H-naphtho<2,3-b>carbazole-7,12-dione