Methanol → 3,4,5-Trihydroxy-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

Participants

Reaction Steps

Final compound 3,4,5-trihydroxy-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 (I-6) is prepared by following a general procedure given in J. Med. Chem. 1995, 38, 1911). To a stirred mixture of 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 equivalent) in 4:1 MeOH:water at rt, is added dropwise aq potassium hydroxide (1-4 equivalents) and the mixture is stirred at rt until the reaction is substantially complete as monitored by LCMS or TLC. The mixture is acidified with glacial acetic acid and concentrated under reduced pressure. The residue is purified by preparative reverse-phase HPLC or silica gel flash chromatography to afford 3,4,5-trihydroxy-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 (I-6).

Provenance & Evidence