(+)-4-(N-t-butoxycarbonyl)aminomethyl-4,8,8-trimethyl-6,10-dioxa-2-azaspiro[4.5]decane 、
5-氨基-1-环丙基-6,7,8-三氟-4-氧代-1,4-二氢-3-喹啉羧酸 以
乙腈 为溶剂,
反应 6.0h,
以70%的产率得到5-Amino-1-cyclopropyl-6,8-difluoro-4-oxo-7-[4,8,8-trimethyl-4-[[(2-methylpropan-2-yl)oxycarbonylamino]methyl]-6,10-dioxa-2-azaspiro[4.5]decan-2-yl]quinoline-3-carboxylic acid