Trimethylphosphine → HCID 67951267, compound

Participants

Reaction Steps

To a round bottomed flask was added (4-chlorophenyl)(2-(3-(hydroxymethyl)-5-methylisoxazol-4-yl)phenyl)methanone (47.2 mg, 0.144 mmol), DCM, and Et3N (40.1 μl, 0.288 mmol). The solution was cooled to 0° C. before addition of Ms-Cl (13.47 μl, 0.173 mmol). The reaction was stirred at 0° C. for 30 min before addition of water. The layers were separated and the aqueous was extracted with DCM. The combined organics were dried over Na2SO4, filtered, and concentrated to afford crude (4-(2-(4-chlorobenzoyl)phenyl)-5-methylisoxazol-3-yl)methyl methanesulfonate. To a round bottomed flask was added (4-(2-(4-chlorobenzoyl)phenyl)-5-methylisoxazol-3-yl)methyl methanesulfonate (58.4 mg, 0.144 mmol), DMF, and sodium azide (28.1 mg, 0.432 mmol). The reaction was stirred at room temperature for 2 h before diluting with water and extracting the aqueous with EtOAc. The combined organics were washed with brine, dried over Na2SO4, filtered, and concentrated to afford crude (2-(3-(azidomethyl)-5-methylisoxazol-4-yl)phenyl) (4-chlorophenyl)methanone. To a round bottomed flask was added (2-(3-(azidomethyl)-5-methylisoxazol-4-yl)phenyl)(4-chlorophenyl)methanone (50.8 mg, 0.144 mmol), toluene (3 mL), and trimethylphosphine solution (216 μl, 1M in toluene, 0.216 mmol). The reaction was stirred at room temperature over 2 days before purifying via Biotage (EtOAc/hex) to afford 6-(4-chlorophenyl)-1-methyl-4H-benzo[c]isoxazolo[4,3-e]azepine. LC/MS m/z 309 [M+H]+; 1H NMR (400 MHz, Acetone) δ 7.70-7.76 (m, 1H), 7.63-7.70 (m, 1H), 7.32-7.49 (m, 6H), 5.10 (br. s, 1H), 4.10 (br. s, 1H), 2.68 (s, 3H).

Provenance & Evidence