HCID 11387776, compound → HCID 11411038, compound

Participants

Reaction Conditions

Reaction Steps

Sodium perborate tetrahydrate (320 mg, 2.1 mmol) was added as a solid to a stirred solution of (2R)-3-[4′-(2-benzylbenzofuran-3-yl)biphen-4-ylmethylsulfanyl]-2-tert-butoxycarbonylamino-propionic acid (440 mg, 0.74 mmol) in acetic acid (10 mL) at 40° C. This solution was stirred at 40° C. for 2 hours (HPLC control) and then diluted with ethyl acetate (50 mL), washed with water, brine (2×), dried over anhydrous MgSO4, filtered and concentrated in vacuo. Purification of the product by flash column chromatography, using 15% methanol in methylene chloride as eluent, afforded the title compound as a white solid (426 mg, 92%): mp. 202-203° C. Rf 0.40 (20% methanol in dichloromethane). 1H NMR (DMSO-d6, 300 MHz) δ 7.84 (2H, d, J=9 Hz, Ar—H), 7.74 (2H, d, J=9 Hz, Ar—H), 7.60 (4H, m, Ar—H), 7.48 (2H, d, J=9 Hz, Ar—H), 7.29 (5H, m, Ar—H), 7.22 (2H, d, J=8 Hz, Ar—H), 6.58 (1H, br s, NH), 4.51 (2H, s, PhCH2), 4.27 (2H, s, PhCH2S), 4.16 (1H, m, CHN), 3.56 (1H, dd, J=15, 5 Hz, CHHCHN), 3.20 (1H, dd, J=15, 8 Hz, CHHCHN), 1.37 (9H, s, tBu); ESI-LCMS e/z calcd for C36H35NO7S 625.739, found 626 (M+H)+.

Provenance & Evidence