Formaldehyde → HCID 11604986, compound

Participants

Reaction Steps

Molecular sieves (5 g) followed by aqueous formaldehyde (10 ml) were added to a stirred solution of (2S,4S)-4-({4-[(3-chloro-2-fluorophenyl)amino]-7-methoxyquinazolin-6-yl}oxy)piperidine-2-carboxamide (5) (3.1 g, 6.97 mmol) in DCM-AcOH (100:10 ml) at room temperature. The reaction mixture was stirred for 1-2 minutes before solid sodium triacetoxyborohydride (2.93 g, 13.9 mmol) was added portionwise over 5 minutes. The reaction was essentially complete after all the sodium triacetoxyborohydride reducing agent had been added. DCM was added (100 ml) and the reaction was carefully neutralised with saturated aqueous NaHCO3(aq). The organic extract was washed with brine, dried (MgSO4) and concentrated to a yellow foam. The residue was purified by flash chromatography (silica gel, DCM-NH3/MeOH 2%) to give the title product as a white solid (1.8 g, 56%): 1H NMR Spectrum: (DMSO d6) 1.86-1.91 (m, 3H), 2.07-2.09 (m, 1H), 2.20 (s, 3H), 2.47-2.49 (m, 1H), 2.71-2.81 (m, 2H), 3.96 (s, 3H), 4.82 (m, 1H), 7.02 (s, 1H), 7.23 (s, 1H), 7.26-7.29 (m, 2H), 7.47-7.53 (m, 2H), 7.82 (s, 1H), 8.37 (s, 1H), 9.60 (s, 1H); Mass Spectrum: (M+H)+ 460.1.

Provenance & Evidence