2-(1-Methyl-2-oxo-1,2-dihydro-indol-3-ylidene)-malononitrile 、
8-hydroxy-1,3-dimethyl-4H-cyclohepta[c]furan-4-one 在
三乙胺 作用下,
以
乙腈 为溶剂,
以28%的产率得到2-amino-1',8,10-trimethyl-2',7-dioxo-7H-spiro[furo[3',4':6,7]cyclohepta[1,2-b]pyran-4,3'-indoline]-3-carbonitrile