反应详情

A mixture of 4-hydroxy-3-methoxybenzaldehyde (4.6 g, 30 mmoles), 1-methyl hydantoin (3.5 g, 30 mmoles), β-alanine (1.4 g, 16 mmoles), and acetic acid (40 ml) is stirred under an inert atmosphere and heated to reflux. After 8 hours the mixture is stirred into water (300 ml) and the precipitate filtered off, rinsed successively with water (3×), ethanol (2×), and ether (2×) and dried. Recrystallization from acetonitrile gave the pure product (1.1 g), mp 197°-198° C.

1. temperatureheated to reflux
2. filtrationthe precipitate filtered off
3. washrinsed successively with water (3×), ethanol (2×), and ether (2×)
4. customdried
5. customRecrystallization from acetonitrile