反应详情

3.01 g (35 mmol) of acrylic acid methyl ester are added at 0°-5°, while stirring, to a solution of 6.2 g (35 mmol) of 2-(2-aminoethyl)chroman in 200 ml of methanol. Stirring is continued for a further 16 hours at 0°-5° and the mixture is then concentrated by evaporation in vacuo. 8.76 g (95.2%) of crude product are obtained and are chromatographed on 250 g of silica gel (0.040-0.063 mm) using ethyl acetate as the eluant. 5.10 g (55.4%) of N-[2-(chroman-2-yl)ethyl]-N-(2-methoxycarbonylethyl)-amine are thus obtained in the form of a yellow oil. The N-[2-(chroman-2-yl)ethyl]-N-(2-methoxycarbonylethyl)-amine hydrochloride produced therefrom using hydrochloric acid in diethyl ether crystallises from methanol/diethyl ether and melts at 152°-153°.

1. concentrationthe mixture is then concentrated by evaporation in vacuo
2. custom8.76 g (95.2%) of crude product are obtained
3. customare chromatographed on 250 g of silica gel (0.040-0.063 mm)