反应详情

温度

60 °C

To 2-[4-(2-Hydroxyethoxycarbonylamino)phenoxy]propionic acid methyl ester 33 (5 g, 17.66 mmol) in toluene (50 ml) was added 2-(4-Isocyanato-phenoxy)-propionic acid methyl ester 32 (3.9 g, 17.64 mmol) at room temperature and heated to 60° C. for 30 hours. Toluene was distilled off and water (50 ml) was added. The solids were filtered and dried to give crude 34, which was purified by column chromatography on silica gel using chloroform as eluant to get pure 34 (5.5 g, 61.8%) as a white powder. M.p: 98-100° C.

1. distillationToluene was distilled off
2. additionwater (50 ml) was added
3. filtrationThe solids were filtered
4. customdried
5. customto give crude 34, which
6. customwas purified by column chromatography on silica gel