反应详情

Half of the crude 3-(3-bromophenylamino)-1-(2-chlorophenyl)propan-1-ol (0.074 mmol) was mixed with triphosgene (7.5 mg, 0.34 equiv), i-Pr2NEt (26 μL, 2 equiv), pyridine (30 μL, 5 equiv) and acetonitrile (5 mL). The mixture was put in the microwave oven for 30 min at 110° C. LC-MS found the reaction completed. The mixture was concentrated, redissolved in EtOAc (5 mL), washed with 1% aq HCl (2×2 mL), concentrated and purified by preparative HPLC to afford 3-(3-bromo-phenyl)-6-(2-chloro-phenyl)-[1,3]oxazinan-2-one (15.2 mg). LC-MS (3 min) tR=1.86 min., m/z 368,369(M+1). 1H NMR (CDCl3) δ 7.63(d, 1H), 7.56 (s, 1H), 7.43-7.26 (m, 6H), 5.83 (d, 1H), 3.88 (q, 1H), 3.67 (m, 1H), 2.55 (d, 1H), 2.17 (m, 1H).

1. concentrationThe mixture was concentrated
2. dissolutionredissolved in EtOAc (5 mL)
3. washwashed with 1% aq HCl (2×2 mL)
4. concentrationconcentrated
5. custompurified by preparative HPLC