A novel method for metal‐free oxothiolation of ynamides to construct oxazolidine‐2,4‐diones bearing sulfur‐substituted quaternary carbonatoms has been developed. It represents a rare C−O bond cleavage of ynamides, as well as a facile and tandem approach for the formation of C−O, C−S, and C−Cl bonds. This redox‐neutral protocol can be applied to the synthesis of multisubstituted oxazolidine‐2,4‐diones
Palladium-catalyzed hydroacyloxylation of ynamides
作者:Donna L. Smith、William R. F. Goundry、Hon Wai Lam
DOI:10.1039/c1cc13595c
日期:——
In the presence of substoichiometric Pd(OAc)2, carboxylic acids undergo highly regio- and stereoselective additions to ynamides to provide α-acyloxyenamides.
Visible-Light-Promoted Oxo-Sulfonylation of Ynamides with Sulfonic Acids
作者:Lu Wang、Chengrong Lu、Yanni Yue、Chao Feng
DOI:10.1021/acs.orglett.9b00733
日期:2019.5.17
A visible-light-promoted oxo-sulfonylation of ynamides with sulfonicacids is reported, giving rise to a collection of functionalized α-sulfonylated amides in a straightforward manner. The reaction proceeds sequentially through a cascade of electrophilic addition and photoinduced sulfonyl radical-sustained skeleton rearrangement. The high atom economy, mild reaction conditions, and wide substrate scope
Rapid access to cyclopentadiene derivatives through gold-catalyzed cycloisomerization of ynamides with cyclopropenes by preferential activation of alkenes over alkynes
Gold-Catalyzed β-Regioselective Formal [3 + 2] Cycloaddition of Ynamides with Pyrido[1,2-<i>b</i>]indazoles: Reaction Development and Mechanistic Insights
Here, we report an unprecedented gold(I)-induced β-site regioselective formal [3 + 2] cycloaddition of ynamides with pyrido[1,2-b]indazoles, giving 3-amido-7-(pyrid-2′-yl)indoles in good to excellent yields. A complex of gold(I) catalyst with ynamide was isolated and characterized by X-ray diffraction analysis for the first time. Mechanistic investigations suggest the reaction pathway involves a gold-stabilized
在这里,我们报道了前所未有的金(I)诱导的酰胺与吡啶并[1,2- b ]吲唑的金(I)诱导的β位区域选择性形式[3 + 2]环加成反应,得到3-酰胺基7-(吡啶-2'-基吲哚具有良好的优良收率。首次分离了金(I)催化剂与乙酰胺的配合物,并首次通过X射线衍射分析对其进行了表征。机理研究表明,该反应途径涉及金稳定的碳正离子中间体,该中间体依次参与了苯环邻位的连续C–H键功能化。