Trifluoroacetic acid → 6-benzyl-4-((S)-pyrrolidin-3-yloxy)-5,6,7,8-tetrahydro-pyrido[4,3-d]pyrimidine

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Reaction Steps

To a solution of (S)-3-(6-benzyl-5,6,7,8-tetrahydro-pyrido[4,3-d]pyrimidin-4-yloxy)-pyrrolidine-1-carboxylic acid tert-butyl ester (560 mg, 1.364 mmol) in 2 mL of CH2Cl2 was added TFA (1.576 mL, 20.46 mmol). The reaction mixture was stirred at rt for 1 h, concentrated and then eluted through an Isolute SCX-2 cartridge (10 g) to remove excess TFA with (i) MeOH (ii) NH3/MeOH and the basic fraction evaporated in vacuum to give 6-benzyl-4-((S)-pyrrolidin-3-yloxy)-5,6,7,8-tetrahydro-pyrido[4,3-d]pyrimidine (420 mg, quantitative yield) as a yellow gum. LCMS: [M+H]+=311.2, Rt(3)=0.11.

Provenance & Evidence