1-tert-Butyloxycarbonyl-3-bromo-4-oxopiperidine → N-(3,4-dichlorophenyl)-6-(methyloxy)-7-[(4,5,6,7-tetrahydro[1,3]thiazolo[5,4-c]pyridin-2-ylmethyl)oxy]quinazolin-4-amine

Participants

Reaction Conditions

Reaction Steps

To a solution of 2-{[4-[(3,4-dichlorophenyl)amino]-6-(methyloxy)quinazolin-7-yl]oxy}ethanethioamide (0.300 g, 0.733 mmol) in DMF (5 mL) was added 1,1-dimethylethyl 3-bromo-4-oxopiperidine-1-carboxylate (0.310 g, 1.11 mmol). The solution was stirred at 60° C. for 72 h. An additional 0.100 g (0.360 mmol) of 1,1-dimethylethyl 3-bromo-4-oxopiperidine-1-carboxylate was added to the reaction mixture, which was then heated at 60° C. for an additional 24 h. The solvent was removed in vacuo and the crude reaction mixture was purified via column chromatography (SiO2, 50% hexanes/ethyl acetate). This intermediate was then subjected to 10% TFA in CH2Cl2 at room temperature. After removal of the solvent, the crude amine salt was taken up in fresh MeOH and treated with Bio-Rad AG 1-X8 resin hydroxide form until pH 8. Filtration and concentration in vacuo provided 0.247 g (69%) of N-(3,4-dichlorophenyl)-6-(methyloxy)-7-[(4,5,6,7-tetrahydro[1,3]thiazolo[5,4-c]pyridin-2-ylmethyl)oxy]quinazolin-4-amine as a brown oil.

Provenance & Evidence