反应详情

The (S)-5′,6′-dihydrospiro[chromeno[2,3-b]pyridine-5,4′-[1,3]oxazine]-2′,7-diamine (0.008 g, 0.028 mmol) was dissolved in MeOH (1 mL). The 5-chloropicolinic acid (4.91 mg, 0.031 mmol) and 4-(4,6-dimethoxy-1,3,5-triazin-2-yl)-4-methylmorpholin-4-ium chloride (8.63 mg, 0.031 mmol) were added. After 2 h, additional MeOH (0.5 mL) was added, followed by additional 5-chloropicolinic acid (2.5 mg, 0.015 mmol) and additional 4-(4,6-dimethoxy-1,3,5-triazin-2-yl)-4-methylmorpholin-4-ium chloride (4.3 mg, 0.015 mmol). After 14 h, the reaction was taken up in EtOAc (75 mL). The organic phase was washed with half-saturated NaHCO3 (2×10 mL), then with saturated brine (10 mL), dried over MgSO4 and concentrated. The residue was purified by preparative TLC, using 12.5% MeOH-dcm to afford (S)—N-(2′-amino-5′,6′-dihydrospiro[chromeno[2,3-b]pyridine-5,4′-[1,3]oxazin]-7-yl)-5-chloropicolinamide (3.5 mg, 0.0083 mmol). MS (m/z) 422 (M+H)+. 1H NMR (400 MHz, CDCl3) δ: 9.88 (s, 1H), 8.57 (s, 1H), 8.27 (m, 2H), 7.89 (d, 1H, J=8.4 Hz), 7.82 (d, 1H, J=7.4 Hz), 7.76 (m, 2H), 7.32 (d, 1H, J=8.4 Hz), 7.20 (m, 1H), 4.23 (m, 1H), 4.11 (m, 1H), 1.98 (m, 1H), 1.93 (m, 1H).

1. waitAfter 14 h
2. washThe organic phase was washed with half-saturated NaHCO3 (2×10 mL)
3. dry with materialwith saturated brine (10 mL), dried over MgSO4
4. concentrationconcentrated
5. customThe residue was purified by preparative TLC