1: 9-methoxy-2,3-dimethyl-9-phenyl-7H-8,9-dihydropyrano[2,3-c]imidazo[1,2-a]pyridine-6-carboxylic acid; O-(1H-benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium hexafluorophosphate in dichloromethane 2 h; Heating / reflux; 2: anhydrous cyclopropylamine in dichloromethane T=20°C; 1.5 h;

1: 9-methoxy-2,3-dimethyl-9-phenyl-7H-8,9-dihydropyrano[2,3-c]imidazo[1,2-a]pyridine-6-carboxylic acid; O-(1H-benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium hexafluorophosphate in dichloromethane 2 h; Heating / reflux; 2: trimethylene imine in dichloromethane T=20°C; 2 h;

1: 9-methoxy-2,3-dimethyl-9-phenyl-7H-8,9-dihydropyrano[2,3-c]imidazo[1,2-a]pyridine-6-carboxylic acid; O-(1H-benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium hexafluorophosphate in dichloromethane 2 h; Heating / reflux; 2: methylamine in ethanol; dichloromethane T=20°C; 1 h;

1: 9-methoxy-2,3-dimethyl-9-phenyl-7H-8,9-dihydropyrano[2,3-c]imidazo[1,2-a]pyridine-6-carboxylic acid With O-(benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium tetrafluoroborate in dichloromethane 2 h; Heating; 2: trimethylene imine in dichloromethane T=20°C; 2 h; Further stages. Title compound not separated from byproducts.;

1: 9-methoxy-2,3-dimethyl-9-phenyl-7H-8,9-dihydropyrano[2,3-c]imidazo[1,2-a]pyridine-6-carboxylic acid; O-(1H-benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium hexafluorophosphate in dichloromethane 2 h; Heating / reflux; 2: methylamine in ethanol; dichloromethane T=20°C; 1 h;