Ethanol → HCID 9905714, compound

Participants

Reaction Steps

Solid sodium tetraborohydride (287 mg, 7.6 mmol, 10 equiv. was added in one portion to a rapidly stirred solution of 180 (365 mg, 0.76 mmol) in a mixture of anhydrous EtOH (8 mL) and anhydrous THF (8 mL) at 0° C. The reaction mixture was allowed to stir at room temperature for 1 hour at room temperature at which time TLC (5% methanol; 95% chloroform) revealed the complete consumption of starting material. The reaction mixture was diluted with ethyl acetate (100 mL), washed with water (2×100 mL), brine (100 mL) and dried over magnesium sulphate. Filtration and evaporation of excess solvent afforded the crude product as a brown viscous oil. Flash chromatography (silica gel, 70% 40-60° petroleum ether, 30% ethyl acetate yield the final product (181) (271 mg, 0.77 mmol, 74%). 1HNMR (270 MHz, CDCl3) δ 7.89 (d, 1H, J=4.03 Hz), 7.53 (s, 1H), 7.51 (s, 1H), 7.40-7.20 (m, 5H), 6.83 (s, 1H), 4.50-4.35 (m, 1H), 3.96 (s, 3H), 3.94 (s, 3H), 3.66-3.36 (m, 2H). 13C NMR (67.8 MHz, CDCl3) δ 162.6, 161.5, 151.9, 147.8, 140.4, 133.3, 128.8, 127.6, 127.1, 124.9, 123.6, 119.0, 111.6, 109.8, 56.2, 53.9, 35.4. HRMS (FAB) calcd for C20H19N2O3 (M+.+1) 335.1398, found 335.1396.

Provenance & Evidence