反应详情

At −10° C., trifluoromethanesulphonic anhydride (42 μl, 1.5 eq.) was added to a solution of 63 mg (0.16 mmol) of tert-butyl{6-[({[2-(methylamino)-2-oxo-1-phenylethylidene]amino}oxy)methyl]pyridin-2-yl}carbamate (36:64 mixture of Z and E diastereoisomers) and pyridine (53 μl, 4 eq.) in acetonitrile (1.6 ml). After warming to room temperature, the mixture was stirred for a further 1 h at 50° C. and then cooled again to room temperature. Then, 32 mg of sodium azide were added and the mixture was stirred again at 50° C. for one hour. The mixture was cooled to room temperature and a sample was analyzed using LCMS. The sample comprises 87% of the expected tert-butyl {6-[({[(1-methyl-1H-tetrazol-5-yl)(phenyl)methylene]amino}oxy)methyl]pyridin-2-yl}carbamate (36:64 mixture of Z and E diastereoisomers).

1. temperaturecooled again to room temperature
2. stirringthe mixture was stirred again at 50° C. for one hour
3. temperatureThe mixture was cooled to room temperature