Ethanol → Cytidine, N-benzoyl-2′-deoxy-5-[3-[(trifluoroacetyl)amino]-1-propenyl]-

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Reaction Steps

Repeating the nucleoside precursor synthesis procedure of Example I, but replacing 5-chloromercuri-2'-deoxyuridine with 5-chloromercuri-2'-deoxycytidine is productive of 5-(3-trifluoroacetylaminopropenyl)-2'-deoxycytidine (UVmax 287 mn). Purified 5-(3-trifluoroacetyl-aminopropenyl)-2'-deoxycytidine (1.3 g, 4.6 mmol) is stirred in 80 ml anhydrous ethanol, benzoyl anhydride (1.5 g, 7 mmol) is added, and the reaction refluxed. Five additional 1.5 g portions of benzoyl anhydride are added hourly. After the reaction is judged complete by thin layer chromatography [silica plates eluting n-butanol/methanol/conc NH4OH/H2O (60:20:1:20)in 6-10 hours, the reaction is cooled and concentrated under reduced pressure to a semisolid. The solid is triturated with ether three times, decanted and dried. The crude product is crystallized from water to give chromatographically pure N4-benzoyl-5-(3-trifluoroacetylaminopropenyl)-2'-deoxycytidine as a white solid. The product decomposes above 120° C.; UV λmax 311 nm.

Provenance & Evidence