(rac.)-(1R*,5S*)-6-[cyclopropyl-(2,3-dichIorobenzyl)carbamoyl]-7-(4-hydroxy-phenyl)-3,9-diazabicyclo[3.3.1]non-6-ene-3,9-dicarboxylic acid di-tert-butyl ester 、
2-(2-chloro-3,6-difluorophenyl)-4-chloromethyloxazole 在
potassium carbonate 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
反应 2.0h,
以60%的产率得到(rac.)-(1R*,5S*)-7-{4-[2-(2-chloro-3,6-difluorophenyl)oxazol-4-ylmethoxy]phenyl}-6-[cyclopropyl-(2,3-dichlorobenzyl)carbamoyl]-3,9-diazabicyclo[3.3.1]non-6-ene-3,9-dicarboxylic acid di-tert-butyl ester