[CH3:1][C:2]1[N:3]=[C:4]([C:10]2[CH:11]=[N:12][CH:13]=[CH:14][CH:15]=2)[S:5][C:6]=1[N+:7]([O-])=O.[Sn](Cl)Cl.C(OC)(C)(C)C.[Cl-].[Na+]>Cl.C(OCC)(=O)C>[CH3:1][C:2]1[N:3]=[C:4]([C:10]2[CH:11]=[N:12][CH:13]=[CH:14][CH:15]=2)[S:5][C:6]=1[NH2:7]10.1 g (45.6 mmol) of 3-(4-methyl-5-nitro-1,3-thiazol-2-yl)pyridine (for preparation see DE 2221647) were dissolved in 100 ml of 10% hydrochloric acid together with 10 ml of conc. hydrochloric acid, and 25 g of tin(II) chloride dissolved in 10% hydrochloric acid were added in portions, and the mixture was stirred for 1 h (hour), in the course of which heating occurred. The mixture was poured into ice/sodium hydroxide solution, methyl t-butyl ether, ethyl acetate and saturated sodium chloride solution were added, the mixture was extracted 4 times at pH=10 with ethyl acetate, the combined organic phases were dried with Mg504 and the mixture was concentrated. The residue was recrystallized from benzotrifluoride.
読み込み中…
