Trifluoroacetic acid → (S)-ethyl 8-(2-amino-6-((R)-2,2,2-trifluoro-1-(3'-(methylsulfonyl)-5-propyl-[1,1'-biphenyl]-2-yl)ethoxy)pyrimidin-4-yl)-2,8-diazaspiro[4.5]decane-3-carboxylate

Participants

Reaction Steps

To a solution of (S)-2-tert-butyl 3-ethyl 8-(2-amino-6-((R)-2,2,2-trifluoro-1-(3′-(methylsulfonyl)-5-propyl-[1,1′-biphenyl]-2-yl)ethoxy)pyrimidin-4-yl)-2,8-diazaspiro[4.5]decane-2,3-dicarboxylate in CH2Cl2 (4 mL) was added TFA (2.0 mL) dropwise at 0° C. The reaction mixture was stirred at RT for 2 h, then concentrated in vacuo. The pH was adjusted to 7-8 with saturated aqueous NaHCO3 solution. The aqueous layer was extracted with CH2Cl2, washed with brine, dried over Na2SO4, filtered, and concentrated in vacuo. Purification by normal phase silica gel column (CH2Cl2/MeOH) provided (S)-ethyl 8-(2-amino-6-((R)-2,2,2-trifluoro-1-(3′-(methylsulfonyl)-5-propyl-[1,1′-biphenyl]-2-yl)ethoxy)pyrimidin-4-yl)-2,8-diazaspiro[4.5]decane-3-carboxylate as a white solid.

Provenance & Evidence