Catalytic Domino Reaction of Ketones/Aldehydes with Me<sub>3</sub>SiCF<sub>2</sub>Br for the Synthesis of α-Fluoroenones/α-Fluoroenals
作者:Xiaoning Song、Jian Chang、Dongsheng Zhu、Jiaheng Li、Cong Xu、Qun Liu、Mang Wang
DOI:10.1021/acs.orglett.5b00488
日期:2015.4.3
α-fluoroenals is described to undergo the in situ formation of difluorocarbene and silyl enol ether, difluorocyclopropanation, desilylation, ring-opening, and defluorination sequence. In this tandem reaction, Me3SiCF2Br acts as not only the difluorocarbene source but also the TMS transfer agent as well as internal bromide and fluoride anion catalyst. It allows the transformations to occur smoothly under only
可烯化的羰基化合物与Me 3 SiCF 2 Br的独特的多米诺反应,以构建α-氟烯和α-氟烯,被描述为原位形成二氟卡宾和甲硅烷基烯醇醚,二氟环丙烷化,甲硅烷基化,开环和脱氟序列。在该串联反应中,Me 3 SiCF 2 Br不仅充当二氟卡宾源,而且还充当TMS转移剂以及内部溴化物和氟化物阴离子催化剂。它允许仅在催化量的n -Bu 4 NBr作为引发剂的情况下平稳地进行转变。