We herein report the synthesis of 3-fluoro-2-methylene-pyrrolidine (3a) and -piperidine (3b) from 1,5- and 1,6-aminoalkynes, respectively, using a combination of a gold-catalyzed hydroamination reaction followed by electrophilic trapping of an intermediate cyclic enamine by Selectfluor. Careful attention was paid to the elucidation of the mechanism and Selectfluor was suggested to play the double role of promoting the oxidation of gold(I) to a gold(III) active species and also the electrophilic fluorination of the enamine intermediates.
我们在此报告了通过使用金催化的氢胺化反应,然后通过Selectfluor对中间环烯胺进行亲电俘获,从1,5-和1,6-氨基炔烃分别合成3-氟-2-亚甲基吡咯烷(3a)和吡啶(3b)。我们特别关注了机制的阐明,建议Selectfluor在促进金(I)的氧化为金(III)活性物种的同时,还扮演了对环烯胺中间体进行亲电氟化的双重角色。