1-[(Ethoxycarbonothioyl)sulfanyl]cyclobutyl acetate (xanthate 7) was found to add to electronically unbiased alkenes and to certain heteroarenes. In the latter case, this corresponds to a variant of the Minisci reaction and allows the late-stage modification of biologically active substances. Saponification of the acetate furnishes the corresponding cyclobutanols, which, in the case of the nicotine adduct, can be converted into fluorocyclobutanes by the action of DAST. Fluorocyclobutyl substituted aromatics and heteroaromatics are increasingly present in drug candidates. Heating of the acetoxycyclobutyl derivative of caffeine with TFA gives rise to the cyclobutene analogue. Finally, O-ethyl S-[1-(2,2,2-trifluoroethoxy)cyclobutyl] carbonodithioate, obtained unexpectedly while optimizing the synthesis of xanthate 7, is a very promising reagent for the introduction of the very rare 2,2,2-trifluoroethoxycyclobutyl motif.

中文翻译：

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环丁醇和氟环丁烷的实用途径

发现 1-[(乙氧基碳硫酰基) 硫烷基] 环丁基乙酸酯 (黄原酸酯7 ) 添加到电子无偏烯烃和某些杂芳烃。在后一种情况下，这对应于Minisci反应的变体，并允许对生物活性物质进行后期修饰。乙酸盐的皂化提供相应的环丁醇，在尼古丁加合物的情况下，可以通过 DAST 的作用将其转化为氟环丁烷。氟环丁基取代的芳烃和杂芳烃越来越多地出现在候选药物中。用 TFA 加热咖啡因的乙酰氧基环丁基衍生物产生环丁烯类似物。最后，O-乙基S-[1-(2,2,2-三氟乙氧基)环丁基]二硫代碳酸酯，在优化黄原酸酯7的合成时意外获得，是一种非常有前途的试剂，用于引入非常罕见的 2,2,2-三氟乙氧基环丁基基序。