1,1'-Carbonyldiimidazole → N-((R)-1-(3,4-dichlorophenyl)ethyl)-2-(1,1,1-trifluoro-3-hydroxypropan-2-ylamino)-5,6-dihydropyrido[3,4-d]pyrimidine-7(8H)-carboxamide

Participants

Reaction Steps

To a stirred solution of 185 (21.0 mg, 0.111 mmol) in DCM (1 mL) at RT under nitrogen was added sequentially DIPEA (38.5 μL, 0.221 mmol) neat by syringe followed by CDI (17.9 mg, 0.111 mmol) neat as a solid. After stirring for 30 min, the solution was added by pipet to a flask containing solid 354 (29 mg, 0.111 mmol). The reaction was stirred at RT under nitrogen overnight. The reaction was diluted to 30 mL with DCM and washed sequentially with 2 N HCl (2×30 mL) with 2N HCl and satd. aq. NaHCO3 (2×30 mL). The organics were dried (MgSO4), filtered and concentrated to a yellow foam. The crude product was purified by SiO2 chromatography (Biotage 12S) eluting with EtOAc. The product containing fractions were pooled and concentrated to afford 10 mg (19%) of I-92 as a yellow residue: 1H NMR (400 MHz, CDCl3) δ 8.12 (s, 1H), 7.39 (m, 2H), 7.17 (dd, 1H), 5.57 (d, 1H), 4.97 (m, 1H), 4.91 (m, 1H), 4.75 (d, 1H), 4.36 (s, 2H), 3.96 (m, 2H), 3.65 (m, 2H), 2.69 (dd, 2H), 1.48 (d, 6H); MS m/z (APCI-pos) M+1=478.5.

Provenance & Evidence