Enaminones are synthesized by the rhodium(II)-catalyzed denitrogenative rearrangement reaction of 1-(N-sulfonyl-1,2,3-triazol-4-yl)alkanols, which are readily prepared from propargylic alcohols and N-sulfonyl azides. Intramolecular 1,2-hydride (or -alkyl) migration occurs with an intermediary α-imino rhodium(II) carbenoid species generated through denitrogenation of the 1,2,3-triazol-4-yl moiety. The
烯胺酮是通过铑 (II) 催化的 1-(N-磺酰基-1,2,3-三唑-4-基) 烷醇的脱氮重排反应合成的,该反应很容易由炔丙醇和 N-磺酰基叠氮化物制备。分子内 1,2-氢化物(或-烷基)迁移与通过 1,2,3-三唑-4-基部分脱氮生成的中间 α-亚氨基铑 (II) 类卡宾物质一起发生。得到的烯胺酮被转化为各种杂环,并取代了 N-磺酰基。
Unlock the C–N Bond Amidation of Enaminones: Metal-Free Synthesis of Enamides by Water-Assisted Transamidation
作者:Haozhi Wu、Kang Chen、Yunyun Liu、Jie-Ping Wan
DOI:10.1021/acs.joc.3c01926
日期:2024.1.5
The C–N bond transamidation of primary amides with N,N-dimethyl enaminones has been efficiently realized by heating in the presence of trifluoromethanesulfonic acid (TfOH). The method enables the practical synthesis of valuable enamides without the use of any metal reagent. In addition, this transamidation protocol can also be expanded to the reactions of sulfonamides, and the late-stage functionalization