10-(2,4-Dichlorophenyl)-10,11-diazatetracyclo[6.5.2.02,7.09,13]pentadeca-2,4,6,9(13),11-pentaene-12-carboxylic acid 、
5,6-benzobicyclo<2.2.2>octen-2-one 、
六甲基二硅氮烷 、
正丁基锂 、
草酸二乙酯 在
ethyl 2-oxo-2-(10-oxotricyclo[6.2.2.0(2,7)]dodeca-2,4,6-trien-9-yl)acetate 作用下,
以was obtained (2.3 g, 63%)的产率得到ethyl 2-oxo-2-(10-oxotricyclo[6.2.2.0(2,7)]dodeca-2,4,6-trien-9-yl)acetate