Sodium borohydride → HCID 18512377, compound

Participants

Reaction Steps

The product from Example 41A (0.6 g, 1.27 mmoles) in benzene (11.6 mL) and ethanol (11.6 mL) was treated with lead tetraacetate (0.6215 g, 1.4 mmoles) at 0° C. The reaction mixture turned from clear and colorless to light yellow and was stirred for 15 minutes. The mixture was diluted with diethyl ether (100 mL), filtered through a 1 inch pad of 1:1 Celite:silica gel and the filtrate was concentrated under reduced pressure. The residue (0.07 g, 0.16 mmoles) was dissolved in ethanol (1.0 mL) and treated with sodium borohydride (0.006 g, 0.16 mmoles). After 30 minutes, the reaction mixture was filtered through silica gel using 2:1 ethyl acetate:hexanes and concentrated under reduced pressure. The residue was purified by preparative HPLC (CH3CN:0.1% TFA in H2O) on a YMC ODS Guardpak column to provide the title compound as a brown oil (0.055 g). 1H NMR (300 MHz, CDCl3) δ7.21 (m, 10H), 6.75 (dd, J=8.8, 1.7 Hz, 2H), 6.04 (s, 1H), 4.66 (dd, J=5.4, 3.7 Hz, 1H), 4.57 (d, J=10.3 Hz, 2H), 4.52 (d, J=10.3 Hz, 2H), 4.21 (s, 1H), 4.02 (m, 1H), 3.95 (m, 1H), 3.72 (s, 1H), 2.76 (s, 3H), 1.98 (s, 3H); MS (APCI+) m/z 441 (M+H)+.

Provenance & Evidence