1,2-Dichloroethane → HCID 71699282, compound

Participants

Reaction Steps

(E)-3-{1′-(2-Phenyl-ethyl)-3,4-dihydro-4-oxo-spiro[2H-(1,3)-benzoxazine-2,4′-piperidin]-6-yl}-acrylic acid (240 mg, 0.612 mmol) was dissolved in DCM (20 ml) and TEA (0.17 ml, 1.23 mmol). EDC (169 mg, 0.88 mmol), HOBT (119 mg, 0.88 mmol) and NH2OTHP (86 mg, 0.74 mmol) were added and the mixture was stirred at RT overnight. The mixture was partitioned between DCM and 5% aqueous NaHCO3 and the organic phase was dried over Na2SO4 and evaporated. The crude mixture was purified by column chromatography (eluent: DCM/MeOH 95:5). The resulting (E)-3-{1′-(2-phenyl-ethyl)-3,4-dihydro-4-oxo-spiro[2H-(1,3)-benzoxazine-2,4′-piperidin]-6-yl}-N-(tetrahydro-pyran-2-yloxy)-acrylamide was dissolved in DCM and treated with 4 M HCl in dioxane for 3 h. The precipitate was filtered off and washed with DCM to give (E)-3-{1′-(2-phenyl-ethyl)-3,4-dihydro-4-oxo-spiro[2H-(1,3)-benzoxazine-2,4′-piperidin]-6-yl}-N-hydroxy-acrylamide hydrochloride (175 mg) as a white solid.

Provenance & Evidence