Diisobutylaluminum hydride → HCID 21129381, compound

Participants

Reaction Conditions

Reaction Steps

To an oven-dried flask containing dry THF (10 mL) under argon at −78° C. was added a 1 M solution of (iBu)2AlH in CH2Cl2 (16.3 mL). This mixture was stirred at −78° C. for 5 min. To this was (R)-8-fluoro-5-methyl-2,3,5,6-tetrahydroazepino[4,5-b]indol-4(1H)-one (0.236 g, 1.02 mmol) in dry THF (16 mL). The reaction mixture was stirred at rt for 72 h, cooled to 0° C., then quenched by the addition of MeOH (4.5 mL). The mixture was partitioned between CH2Cl2 and 1 M aq NaO2CCH(OH)CH(OH)CO2K. The CH2Cl2 extracts were washed with brine, and dried, filtered and concentrated to give an oil. The oil was purified by silica chromatography to give the amine. To a solution of this amine (0.105 g, 0.48 mmol) in dry MeOH (4 mL) was added fumaric acid (0.028 g, 0.24 mmol) in MeOH (2.2 mL). The mixture was stirred overnight, concentrated, and the residue was dissolved in hot MeOH from which crystalline product was recovered: mp 256-258° C.; MS (ESI+) m/z 219.1; 1H NMR (CD3SOCD3, 300 MHz) δ 10.83 (1H), 9.3-8.5 (2H), 7.35 (1H), 7.01 (1H), 6.78 (1H), 6.43 (1H), 3.22-2.70 (8H), 1.30 (3H); Anal. C 64.94, H 6.27, N 10.07.

Provenance & Evidence