Trifluoroacetic acid → N-[6-(3-bromo-benzenesulfonyl)-5,6,7,8-tetrahydro-pyrido[4,3-d]pyrimidin-2-yl]-3-chloro-benzamide

Participants

Reaction Conditions

Reaction Steps

Trifluoroacetic acid 6.2 ml (81 mmol) was added to a solution of 2-(3-chloro-benzoylamino)-7,8-dihydro-5H-pyrido[4,3-d]pyrimidine-6-carboxylic acid tert-butyl ester 487 mg (1.25 mmol) in CH2Cl2 (8 ml) under nitrogen as inert gas and stirring was performed for 1.5 h at RT. After removal of the solvent, the intermediate (3-chloro-N-(5,6,7,8-tetrahydro-pyrido[4,3-d]pyrimidin-2-yl)-benzamide trifluoroacetate) was dissolved in CH2Cl2 (15 ml). After the addition of triethylamine 820 μl (5.84 mmol), the solution was cooled to 0° C. and 3-bromo benzenesulfonyl chloride 311 mg (1.37 mmol) was added. The reaction mixture was stirred for 1 h at 0° C. and then overnight at RT. After removal of the solvent, purification was performed by means of column chromatography and the product N-[6-(3-bromo-benzenesulfonyl)-5,6,7,8-tetrahydro-pyrido[4,3-d]pyrimidin-2-yl]-3-chloro-benzamide 525 mg (81% of theoretical) was obtained.

Provenance & Evidence