1,2,3,4,6,7,8,9-octahydro-1,6-dioxo-2-methyl-5-(2-methoxy-5-cyanophenoxy)-9-carbethoxyisoquinoline 在
sodium carbonate 作用下,
生成 (4aS,7aR,12bR)-12-Cyano-9-methoxy-3-methyl-4,7-dioxo-1,2,3,4,5,6,7,7a-octahydro-8-oxa-3-aza-benzo[d]fluorene-4a-carboxylic acid ethyl ester 、
decahydro-1,6-dioxo-2-methyl-9β-carbethoxyisoquinolino<5β,10β-c>-4-cyano-7-methoxy-2,3-dihydrobenzofuran