1,2-Dichloroethane → HCID 178456079, compound

Participants

Reaction Steps

(S)-3-Cyclohexyl-2-(1,1-dioxo-benzo[d]isothiazol-3-ylamino)-propionic acid (150 mg, 0.45 mmol) was combined with EDC (250 mg, 1.3 mmol), HOBt (250 mg, 1.6 mmol), and (2S)-2-amino-1-benzoxazol-2-ylbutan-1-ol (250 mg, 1.2 mmol). Dichloromethane (4 mL) was added and then 4-methylmorpholine (0.5 mL). The reaction mixture was stirred at ambient temperature for 2 h. After dilution with ethyl acetate (150 mL), the solution was washed with 1N aqueous HCl, water, saturated aqueous NaHCO3 solution and brine, dried with MgSO4 and evaporated under vacuum. The crude product was dissolved in dry dichloromethane (10 mL) and Dess-Martin Periodinane (500 mg, 1.2 mmol) was added. After stirring at ambient temperature for 1 h, the reaction mixture was diluted with ethyl acetate (150 mL) and treated with 0.26M Na2S2O3 solution in saturated aqueous NaHCO3. The organic phase was washed with saturated aqueous NaHCO3 and brine, dried with MgSO4 and evaporated. The product was purified by flash chromatography on silica gel (hexane/ethyl acetate 2:1) to yield the title compound (120 mg).

Provenance & Evidence