反应详情

To a stirred mixture of 1-[5-(2-hydroxy-1,1-dimethyl-ethyl)-isoxazol-3-yl]-3-{4-[7-(2-morpholin-4-yl-ethoxy)-benzo[d]imidazo[2,1-b]thiazol-2-yl]-phenyl}-urea (I-1) (1 equivalent) and silver carbonate (0.5-1 equivalent) in toluene at rt is added 1-bromo-2,3,4-tri-O-acetyl-α-D-glucuronic acid methyl ester (0.8-1.5 equivalents) and the mixture is stirred at rt until the reaction is substantially complete as monitored by LCMS or TLC. The mixture is filtered and the filtrate is partitioned between water and either dichloromethane or a mixture of dichloromethane and isopropanol. The separated aqueous layer is further extracted with dichloromethane or a mixture of dichloromethane and isopropanol. The combined organic layers are washed with 2N aq sodium hydroxide dried over magnesium sulfate, filtered, and concentrated under reduced pressure. The residue is purified by preparative reverse-phase HPLC or silica gel flash chromatography to afford 3,4,5-triacetoxy-6-{2-methyl-2-[3-(3-{4-[7-(2-morpholin-4-yl-ethoxy)-benzo[d]imidazo[2,1-b]thiazol-2-yl]-phenyl}-ureido)-isoxazol-5-yl]-propoxy}-tetrahydro-pyran-2-carboxylic acid methyl ester.

1. filtrationThe mixture is filtered
2. customthe filtrate is partitioned between water
3. additioneither dichloromethane or a mixture of dichloromethane and isopropanol
4. extractionThe separated aqueous layer is further extracted with dichloromethane
5. additiona mixture of dichloromethane and isopropanol
6. washThe combined organic layers are washed with 2N aq sodium hydroxide
7. dry with materialdried over magnesium sulfate
8. filtrationfiltered
9. concentrationconcentrated under reduced pressure
10. customThe residue is purified by preparative reverse-phase HPLC or silica gel flash chromatography