2-Chloroethyl chloroformate → 8-[2-(2-Chloroethoxycarbonylamino)-6-methylbenzylamino]-2,3-dimethylimidazo[1,2-a]pyridine
反応式
Cl[C:2]([O:4][CH2:5][CH2:6][Cl:7])=[O:3].[NH2:8][C:9]1[CH:27]=[CH:26][CH:25]=[C:24]([CH3:28])[C:10]=1[CH2:11][NH:12][C:13]1[C:14]2[N:15]([C:19]([CH3:23])=[C:20]([CH3:22])[N:21]=2)[CH:16]=[CH:17][CH:18]=1>ClCCl>[Cl:7][CH2:6][CH2:5][O:4][C:2]([NH:8][C:9]1[CH:27]=[CH:26][CH:25]=[C:24]([CH3:28])[C:10]=1[CH2:11][NH:12][C:13]1[C:14]2[N:15]([C:19]([CH3:23])=[C:20]([CH3:22])[N:21]=2)[CH:16]=[CH:17][CH:18]=1)=[O:3]参加物
4
実験手順
2-Chloroethyl chloroformate (12.4 g, 81 mmol) dissolved in dichloromethane (40 ml) is added dropwise at RT, during the course of about 30 min, to a solution of 8-(2-amino-6-methylbenzylamino)-2,3-dimethylimidazo[1,2-a]pyridine (19.65 g, 70 mmol) in anhydrous dichloromethane (600 ml). The mixture is then stirred at RT for 16 h and then extracted with sodium hydrogen carbonate (4×200 ml). After extraction of the aqueous phases with dichloromethane (200 ml), the combined organic extracts are washed with water (2×200 ml), dried over magnesium sulfate and concentrated. The crude product which remains (33.9 g) is used directly for the further reaction in Example 1b.