反应详情

In a similar manner to Example 1, starting material step (a), the p-toluenesulphonate salt of ethyl 4-aminophenoxyacetate (12.9 g, preparation described by Coutts, I. G. C. et al (1985), J. Chem. Soc. Perkin I, 1829), 4-cyanobenzoyl isocyanate (5.9 g), acetonitrile (400 ml total) and diisopropylethylamine (6.5 ml) were reacted to give, after stirring at ambient temperature for 1.5 hours, a solid, which was crystallised from acetonitrile/ethanol to give ethyl 4-[3-(4-cyanobenzoyl)ureido]phenoxyacetate (10.16 g) as an off-white solid: m.p. 200°-203° C.; NMR Spectrum (DMSO-d6) 1.22 (3H, t), 4.17 (2H, q), 4.75 (2H, s), 6.93 (2H, d), 7.49 (2H, d), 8.02 (2H, d), 8.13 (2H, d), 10.49 (1H, br s), 11.17 (1H, br s); Mass Spectrum m/Z 368 (M+H)+.

1. customto give
2. customa solid, which was crystallised from acetonitrile/ethanol