Triethylazanium;formate → Tert-butyl (S)-3-((5,6,7,8-tetrahydropyrido[4,3-D]pyrimidin-4-YL)amino)pyrrolidine-1-carboxylate

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Reaction Steps

Pd(OH)2/C (6.60 g, 5.3 mmol) was flushed with nitrogen, (S)-3-(6-benzyl-5,6,7,8-tetrahydro-pyrido[4,3-d]pyrimidin-4-ylamino)-pyrrolidine-1-carboxylic acid tert-butyl ester (intermediate 22) dissolved in methanol (164 mL) was added followed by the addition of triethylammonium formate (28.4 g, 188.0 mmol). The reaction mixture was refluxed for 1 h, cooled down to room temperature, filtered through a celite pad and the filtrate was concentrated under vacuum. the residue was recrystallized with methyl tert-butyl ether (200 mL) and heptanes (50 mL) to provide (S)-3-(5,6,7,8-tetrahydro-pyrido[4,3-d]pyrimidin-4-ylamino)-pyrrolidine-1-carboxylic acid tert-butyl ester as a beige solid (25.7 g, 85% yield).

Provenance & Evidence