2-[5,8-dimethyl-7,8-dihydrobenzo[c,d]furo[2,3-f]indol-4(5H)-ylidene]acetaldehyde 、
1,2-dimethylquinolinium 4-methylbenzenesulfonate 在
乙酸酐 作用下,
反应 0.33h,
以50%的产率得到5,8-dimethyl-4-{3-[1-methylquinolin-2(1H)-ylidene]-1-propenyl}-7,8-dihydrobenzo[c,d]furo[2,3-f]indol-5-ium 4-methylbenzenesulfonate