An efficient protocol for synthesizing reverse glycosyl fluorides is described, relying on silver-promoted decarboxylative fluorination of structurally diverse pentofuran- and hexopyranuronic acids under the mild reaction conditions. The potential applications of the reaction are further demonstrated by converting readily available d-uronic acid derivatives into uncommon d-/l-glycosyl fluorides through a C1-to-C5 switch strategy. The reaction mechanism is corroborated by 5-exo-trig radical cyclization of allyl α-d-C-glucopyranuronic acid triggered by decarboxylative fluorination.

中文翻译：

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糖醛酸的自由基脱羧氟化合成逆糖基氟化物和稀有糖基氟化物

描述了一种有效的合成逆向糖基氟化物的方法，该方法依赖于在温和的反应条件下，银促进结构上多样的戊呋喃和六吡喃葡萄糖醛酸的脱羧氟化作用。该反应的潜在应用通过通过C1-C5转换策略将容易获得的d-糖醛酸衍生物转化为不常见的d - 1-糖苷氟来进一步证明。反应机理是通过5-证实外切-三角函数烯丙基α-的自由基环化d -C葡吡喃糖醛酸通过脱羧氟化触发。