反应条件
1: 9-methoxy-2,3-dimethyl-9-(2-methylphenyl)-7H-8,9-dihydro-pyrano[2,3-c]-imidazo[1,2-a]pyridine-6-carboxylic acid hydrochloride; O-(1H-benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium hexafluorophosphate With N-ethyl-N,N-diisopropylamine in N,N-dimethyl-formamide T=50°C; 2 h; 2: 3,3-difluoroazetidine hydrogen chloride salt in N,N-dimethyl-formamide T=50°C; 4 h;
