反应详情

Sodium hydride (8.81 g, 220.38 mmol) was added portionwise to 2-(methylamino)ethanol (16.55 g, 220.38 mmol) in THF (500 mL) at 0° C. over a period of 10 minutes under an atmosphere of argon. The resulting solution was stirred at 0° C. for 1 hour and then 2-amino-6-fluorobenzonitrile (20 g, 146.92 mmol) was added in one portion and the mixture heated at 85° C. for 2 hours. The mixture was quenched with water and then evaporated. The residue was dissolved in EtOAc (300 mL), and the mixture washed sequentially with water (2×300 mL), and then with a saturated solution of NaCl (300 mL). The organic layer was dried over MgSO4, and then evaporated. The residue was purified by chromatography on silica, eluting with a gradient of 0-10%, of a 7M solution of NH3 in MeOH, in CH2Cl2. Fractions containing product were evaporated to afford 2-amino-6-(2-methylaminoethoxy)benzonitrile (12.08 g, 43% yield); Mass spectrum: m/z (ESI+) (M+H)+=192.43. b) Potassium hydroxide (32 g, 570.35 mmol) was added in one portion to 2-amino-6-(2-methylaminoethoxy)benzonitrile (16 g, 83.67 mmol) in ethanol (160 mL). The resulting mixture was heated at 90° C. for 2 days. The mixture was then diluted with water (1000 mL) and acidified to ˜pH1 with 2M HCl. The mixture was loaded onto an SCX column and the product was eluted first using MeOH and then with a 7M solution of NH3 in MeOH. Fractions containing product were combined and evaporated to afford 2-amino-6-(2-methylaminoethoxy)benzoic acid which was used without further purification. c) HATU (35.0 g, 92.04 mmol) was added in one portion to 2-amino-6-(2-methylaminoethoxy)benzoic acid (17.59 g, 83.67 mmol) and DIPEA (15.92 mL, 92.04 mmol) in DMF (200 mL) and the resulting solution was stirred for 1 hour. The mixture was evaporated and the residue dissolved in EtOAc (500 mL). The mixture was washed sequentially with a saturated solution of Na2CO3 (500 mL), water (500 mL), and finally with a saturated solution of NaCl (500 mL). The organic layer was dried over MgSO4, and then evaporated. The residue was purified by chromatography on silica, eluting with a gradient of 0-100% EtOAc in isohexane. Fractions containing product were combined and evaporated to afford 6-amino-4-methyl-2,3-dihydro-1,4-benzoxazepin-5-one (1.635 g, 10% yield); 1H NMR spectrum: (300 MHz, DMSO) δ 3.09 (s, 3H), 3.44 (t, 2H), 4.20 (t, 2H), 5.74 (br s, 2H), 6.22 (dd, 1H), 6.52 (dd, 1H), 7.08 (appt t, 1H); Mass spectrum: m/z (ESI+) (M+H)+=193.41.

1. customwas used without further purification
2. customThe mixture was evaporated
3. dissolutionthe residue dissolved in EtOAc (500 mL)
4. washThe mixture was washed sequentially with a saturated solution of Na2CO3 (500 mL), water (500 mL)
5. dry with materialThe organic layer was dried over MgSO4
6. customevaporated
7. customThe residue was purified by chromatography on silica
8. washeluting with a gradient of 0-100% EtOAc in isohexane
9. additionFractions containing product
10. customevaporated