(4R)-2,2-dimethyl-3,4-dihydrochromen-4-amine

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

Procedure: A slurry of N,N-disuccinimidyl carbonate (434 mg, 1.69 mmol), acetonitrile (6 mL), pyridine (0.137 mL, 1.69 mmol), and 5-amino-1-methyl-3,4-dihydroquinazolin-2(1H)-one (A-1) (300 mg, 1.69 mmol) was stirred at room temperature. After 45 min, N,N-diisopropylethylamine (0.879 mL, 5.08 mmol) and (R)-2-hydroxy-2-phenylacetate salt of (R)-2,2-dimethylchroman-4-amine (B-2) (558 mg, 1.69 mmol) were added. After 30 minutes, EtOAc (50 mL) and 2N aqueous HCl (20 mL) were added and the layers separated. The organic extract was washed with brine (10 mL), dried (Na2SO4), filtered, and concentrated. The residue was purified by silica gel chromatography (0-10% MeOH/EtOAc gradient) to afford the title compound (565 mg, 1.49 mmol, 88% yield). 1H NMR (300 MHz, DMSO-d6) δ 7.80 (s, 1H), 7.42 (d, J=8.1 Hz, 1H), 7.25 (t, J=10.7 Hz, 1H), 7.16 (dd, J=16.6, 8.2 Hz, 3H), 6.89 (t, J=7.0 Hz, 1H), 6.73 (d, J=8.6 Hz, 2H), 6.63 (d, J=8.1 Hz, 1H), 4.94 (dd, J=15.2, 10.0 Hz, 1H), 4.18 (s, 2H), 3.14 (s, 3H), 2.13 (dd, J=13.2, 6.2 Hz, 1H), 1.69 (dd, J=30.9, 18.0 Hz, 1H), 1.39 (s, 3H), 1.27 (s, 3H). MS (ESI+) m/z 449 (M+H)+. After 30 minutes the layers separated The organic extract was washed with brine (10 mL) dried (Na2SO4) filtered concentrated The residue was purified by silica gel chromatography (0-10% MeOH/EtOAc gradient)

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

Procedure: A slurry of N,N-disuccinimidyl carbonate (434 mg, 1.69 mmol), acetonitrile (6 mL), pyridine (0.137 mL, 1.69 mmol), and 5-amino-1-methyl-3,4-dihydroquinazolin-2(1H)-one (A-1) (300 mg, 1.69 mmol) was stirred at room temperature. After 45 min, N,N-diisopropylethylamine (0.879 mL, 5.08 mmol) and (R)-2-hydroxy-2-phenylacetate salt of (R)-2,2-dimethylchroman-4-amine (B-2) (558 mg, 1.69 mmol) were added. After 30 minutes, EtOAc (50 mL) and 2N aqueous HCl (20 mL) were added and the layers separated. The organic extract was washed with brine (10 mL), dried (Na2SO4), filtered, and concentrated. The residue was purified by silica gel chromatography (0-10% MeOH/EtOAc gradient) to afford the title compound (565 mg, 1.49 mmol, 88% yield). 1H NMR (300 MHz, DMSO-d6) δ 7.80 (s, 1H), 7.42 (d, J=8.1 Hz, 1H), 7.25 (t, J=10.7 Hz, 1H), 7.16 (dd, J=16.6, 8.2 Hz, 3H), 6.89 (t, J=7.0 Hz, 1H), 6.73 (d, J=8.6 Hz, 2H), 6.63 (d, J=8.1 Hz, 1H), 4.94 (dd, J=15.2, 10.0 Hz, 1H), 4.18 (s, 2H), 3.14 (s, 3H), 2.13 (dd, J=13.2, 6.2 Hz, 1H), 1.69 (dd, J=30.9, 18.0 Hz, 1H), 1.39 (s, 3H), 1.27 (s, 3H). MS (ESI+) m/z 449 (M+H)+. After 30 minutes the layers separated The organic extract was washed with brine (10 mL) dried (Na2SO4) filtered concentrated The residue was purified by silica gel chromatography (0-10% MeOH/EtOAc gradient)