反应详情

In a variation to the procedure referred to in example1, 6-(2-p-tolyl-vinyl)-pyridine-2-carboxylic acid (2.81 g, 11.7 mmol) was brought to reaction with triethylamine (1.21 g, 12.0 mmol), diphenyl phosphoryl azide (3.56 g, 12.9 mmol) and butanol (33 ml). After extractive workup the residue was refluxed (4 hr) with 3N HCl. Extractive workup and chromatography (SiO2 with AcOEt/hexane/NEt3=10:20:1) afforded the title compound as an oil which was crystallized as the yellow hydrochloride salt (0.95 g, 33%). Mp. >250° C. (MeOH/Et2O), MS: m/e=210 (M+).