反应详情

A solution of 340 mg of N1-(2-methaxy-5-nitrophenyl)-N1, N2, N2-trimethylethane-1,2-diamine (2) in 20 mL of ethanol containing 5% w/w of Pd—C (10%) was subjected to hydrogenation (1 atm, balloon) for 1.5 h. The contents of the flask were passed through a short pad of celite and washed with MeOH. The filtrate was evaporated under reduced pressure and crude amine obtained was carried over to the next reaction without further purification. Thiocarbodiimidazole (260 mg, 1.46 mmol) was added to the crude amine in dichloromethane (10 mL) at room temperature. The reaction mixture was stirred at room temperature for 1 h, and concentrated. The crude product was then purified by flash chromatography on silica gel to give N1-(5-isothiocyanato-2-methoxyphenyl)-)-N1, N2, N2-trimethylethane-1,2-diamine (3) (110 mg, 0.42 mmol, 31%).

1. washwashed with MeOH
2. customThe filtrate was evaporated under reduced pressure and crude amine
3. customobtained
4. customwas carried over to the next reaction without further purification
5. concentrationconcentrated
6. customThe crude product was then purified by flash chromatography on silica gel