AbstractThe defluorinative functionalization of allylic fluorides represents an attractive approach for the preparation of molecules containing a monofluoroalkene core. In that sense, introducing a “boryl nucleophile” is a powerful strategy to obtain polyvalent borylated intermediates as versatile synthetic precursors. To perform this reaction without the use of transition metals, the nucleophilic character of a diborane/fluoride system was exploited in a SN2′ type‐substitution reaction of gem‐difluoropropenes to install a pinacolborane group. The use of HMDS as a silylated additive is necessary to improve the reactivity. A direct oxidation of the intermediate boronates allowed the isolation of the corresponding β‐fluoroallyl alcohols in low to good yields (9–81 %). Other synthetic transformations of a (2‐fluoroallyl)boronate are also illustrated.
摘要烯丙基氟化物的脱氟官能化是制备含有单氟烯核心分子的一种极具吸引力的方法。从这个意义上讲,引入 "亲硼酸核 "是获得多价硼酸化中间体作为多功能合成前体的有力策略。为了在不使用过渡金属的情况下进行这一反应,我们在宝石-二氟丙烯的 SN2′ 型取代反应中利用了二硼烷/氟化物体系的亲核特性来安装频哪醇硼烷基团。为了提高反应活性,必须使用 HMDS 作为硅烷化添加剂。通过直接氧化中间硼酸盐,可以分离出相应的 β-氟烯丙基醇,产率从低到高(9-81%)不等。此外,还说明了 (2-fluoroallyl)boronate 的其他合成转化。