Acetic Acid → 2-cyclopropyl-1,6,7,8-tetrahydrothiopyrano[3,2-d]pyrimidin-4-one

Participants

Reaction Conditions

Reaction Steps

Sodium metal (3.94 g, 0.17 g atom) was dissolved in methanol (150 ml) and cyclopropylcarboxamidine hydrochloride (21.0 g, 0.174 mol) was added followed after 1/4 hour stirring by the addition of ethyl 3-oxotetrahydrothiopyran-2-carboxylate (27.2 g, 0.145 mol). The reaction mixture was stirred at 25° C. for 18 hours then treated with ice water (200 ml) and neutralized with acetic acid to give 24.6 g of the title compound which melted at 249°-250° C.

Provenance & Evidence