反应详情

A solution of trichloromethyl chloroformate (4.1 g) in methylene chloride (15 ml) is slowly added to a stirred mixture of ethyl-3-amino-3-methylbutanoate (3 g), triethylamine (6.6 g) and methylene chloride (30 ml) at 5° C. The mixture is stirred overnight at room temperature, refluxed for 3 hours, cooled and anhydrous ether added thereto. The precipitated triethylamine hydrochloride is filtered and the filtrate evaporated to yield 2-ethoxycarbonyl-1,1-dimethylethylisocyanate as an oil (3.5 g).

1. temperaturerefluxed for 3 hours
2. temperaturecooled
3. filtrationThe precipitated triethylamine hydrochloride is filtered
4. customthe filtrate evaporated