7-[2-(1H-indol-5-yloxy)-ethyl]-3,4-dihydro-2H-[1,8]naphthyridine-1-carboxylic acid tert-butyl ester 、
4-(N,N-dimethylamino)-4-oxotetrolic acid ethyl ester 在
cesium fluoride 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
反应 2.0h,
生成 (Z)-3-[5-[2-[8-tert-butoxycarbonyl(5,6,7,8-tetrahydro[1,8]naphthyridin-2-yl)]ethoxy]indol-1-yl]-4-oxo-4-(N,N-dimethylamino)crotonic acid ethyl ester 、 (E)-3-[5-[2-[8-tert-butoxycarbonyl(5,6,7,8-tetrahydro[1,8]naphthyridin-2-yl)]ethoxy]indol-1-yl]-4-oxo-4-(N,N-dimethylamino)crotonic acid ethyl ester