C-(5-methylfuran-2-yl)-C-(3-methyloxetan-3-yl)methylamine → 3-{[(5-Methylfuran-2-yl)-(3-methyloxetan-3-yl)methyl]amino}-4-(2-oxo-2,3-dihydrobenzooxazol-7-ylamino)cyclobut-3-ene-1,2-dione

Participants

Reaction Conditions

Reaction Steps

A mixture of 0.35 g (1.28 mmol, 1 eq) of 3-ethoxy-4-(2-oxo-2,3-dihydrobenzooxazol-7-ylamino)cyclobut-3-ene-1,2-dione and 0.278 g (1.53 mmol, 1.2 eq) of C-(5-methylfuran-2-yl)-C-(3-methyloxetan-3-yl)methylamine in 6 ml of methanol was heated at 65° C. for 5 hours. The methanol was evaporated off and the residue was chromatographed on silica gel, eluted with 95/5 dichloromethane/methanol. The paste obtained was crystallized from ethyl ether, filtered and dried under vacuum at 40° C. 0.24 g of product was obtained in the form of a beige solid. Yield=46%. HPLC 96.4%, ES+ [410].

Provenance & Evidence