4-(3-chloropropyl)-6,7-difluoro-1,4-benzoxazin-3-one

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A 4 mL vial was charged with 4-(3-chloropropyl)-6,7-difluoro-4H-benzo[1,4]oxazin-3-one (0.077 g, 0.3 mmol), 4-cyclopropylmethoxypiperidine (0.047 g, 0.3 mmol), NaI (0.075 g, 0.5 mmol), and K2CO3 (0.069 g, 0.5 mmol) in MeCN (0.5 mL) and shaken at 60° for 20 h. The reaction mixture was quenched with water and the product extracted into EtOAc. The combined organic layers were dried over Na2SO4, filtered, and concentrated. The product was purified by cation exchange column chromatography followed by flash column chromatography (SiO2; EtOAc) to give the title compound (0.050 g, 44%). 1H NMR (CDCl3) d 6.98-6.93 (m, 1H), 6.66-6.62 (m, 1H), 4.39 (s, 2H), 3.74 (t, J=7.2 Hz, 2H), 3.20-3.15 (m, 1H), 3.11 (d, J=6.9 Hz, 2H), 2.61-2.55 (m, 2H), 2.21 (t, J=6.8 Hz, 2H), 2.00-1.96 (m, 2H), 1.79-1.63 (m, 4H), 1.52-1.46 (m, 2H), 0.89-0.85 (m, 1H), 0.38-0.33 (m, 2H), 0.04-0.00 (m, 2H). The reaction mixture was quenched with water the product extracted into EtOAc The combined organic layers were dried over Na2SO4 filtered concentrated The product was purified by cation exchange column chromatography

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A 4 mL vial was charged with 4-(3-chloropropyl)-6,7-difluoro-4H-benzo[1,4]oxazin-3-one (0.077 g, 0.3 mmol), 4-cyclopropylmethoxypiperidine (0.047 g, 0.3 mmol), NaI (0.075 g, 0.5 mmol), and K2CO3 (0.069 g, 0.5 mmol) in MeCN (0.5 mL) and shaken at 60° for 20 h. The reaction mixture was quenched with water and the product extracted into EtOAc. The combined organic layers were dried over Na2SO4, filtered, and concentrated. The product was purified by cation exchange column chromatography followed by flash column chromatography (SiO2; EtOAc) to give the title compound (0.050 g, 44%). 1H NMR (CDCl3) δ 6.98-6.93 (m, 1H), 6.66-6.62 (m, 1H), 4.39 (s, 2H), 3.74 (t, J=7.2 Hz, 2H), 3.20-3.15 (m, 1H), 3.11 (d, J=6.9 Hz, 2H), 2.61-2.55 (m, 2H), 2.21 (t, J=6.8 Hz, 2H), 2.00-1.96 (m, 2H), 1.79-1.63 (m, 4H), 1.52-1.46 (m, 2H), 0.89-0.85 (m, 1H), 0.38-0.33 (m, 2H), 0.04-0.00 (m, 2H). The reaction mixture was quenched with water the product extracted into EtOAc The combined organic layers were dried over Na2SO4 filtered concentrated The product was purified by cation exchange column chromatography