Ammonium Chloride → HCID 9834605, compound

Participants

Reaction Steps

To a stirred solution at −20° C. of a mixture of 198 and 199 in anhydrous THF (15 ml) under nitrogen was added a solution of TBAF (1 ml, 1.0 M in THF). The reaction mixture was allowed to warm up to room temperature over 2 h and stirred at room temperature for 18 h. Then, the reaction mixture was poured into a saturated aqueous solution of NH4Cl and diluted with ethyl acetate. After separation, the organic layer was successively washed with sat. NH4Cl, H2O and brine, dried over anhydrous MgSO4, filtered and concentrated. The crude residue was then purified by flash chromatography on silica gel (AcOEt/hexane: 30/70) to afford the title compound 199 (215 mg, 0.91 mmol, 46% yield over 2 steps) as a pale yellow powder. 1H NMR (300 MHz, acetone-d6) δ (ppm): 9.19 (bs, 1H), AB system (δA=8.08, δB=7.66, J=8.5 Hz, 4H), 7.33 (d, J=7.6 Hz, 1H), 7.05 (t, J=7.3 Hz, 1H), 6.91 (d, J=7.6 Hz, 1H), 6.72 (t, J=7.6 Hz, 1H), 4.67 (bs, 2H), 3.88 (s, 1H).

Provenance & Evidence