作者:Krzysztof Danel、Erik Larsen、Erik B. Pedersen
DOI:10.1055/s-1995-4022
日期:1995.8
Ethyl 2-ethyl-3-oxo-4-phenylbutyrate is synthesized in a high yield from the corresponding benzyl cyanide and ethyl 2-bromobutyrate or by reaction of the potassium salt of ethyl 2-ethylmalonate with phenylacetyl chloride. Condensation of the 3-oxo ester with thiourea, desulfurization with chloroacetic acid and finally condensation with acetals or 1,3-dioxolanes using trimethylsilyl triflate (TMS triflate) as a catalyst or with chloromethyl ethyl ether afforded the 5-ethyl-6-benzyl acyclouridine derivatives.
乙基2-乙基-3-氧基-4-苯基丁酸酯是通过相应的苄腈和乙基2-溴丁酸酯的反应合成的,或通过乙基2-乙基马来酸钾盐与苯乙酰氯的反应合成。然后,3-氧酯与硫脲缩合,随后用氯乙酸脱硫,最终使用三甲基氟硅烷三氟醋酸盐(TMS三氟醋酸盐)作为催化剂或与氯甲基乙醚缩合,得到5-乙基-6-苄基环状乌苷衍生物。