1,2-Dichloroethane → HCID 86671981, compound

Participants

Reaction Steps

TEA (0.25 ml, 1.8 mmol) was added to a suspension of (E)-3-[1′-tert-butoxycarbonyl-4-oxo-spiro(chromane-2,3′-azetidine)-6-yl]-acrylic acid (430 mg, 1.20 mmol) in DCM (13 ml) and the reaction mixture was stirred at RT for 5 min. The resulting clear solution was cooled down to 0° C., EDC (344 mg, 1.80 mmol) and HOBt (243 mg, 1.80 mmol) were added and the mixture was stirred at 0° C. for 2 h. NH2OTHP (168 mg, 1.43 mmol) was added and the mixture was stirred at RT overnight. The reaction mixture was washed with 5% aqueous NaHCO3 solution and brine, the organic layer was dried over Na2SO4, filtered and evaporated. The crude residue was purified by column chromatography on silica gel (eluent: DCM/MeOH 98:2) to give (E)-3-[1′-tert-butoxycarbonyl-4-oxo-spiro(chromane-2,3′-azetidine)-6-yl]-N-(tetrahydro-pyran-2-yloxy)-acrylamide (0.40 g) as a pale yellow solid.

Provenance & Evidence