An efficient intermolecular trans-selective β-hydroamidation of ynamides to furnish a series of (Z)-ethene-1,2-diamide derivatives with excellent regio- and stereo-selectivities is described. The trans-β-addition reactions have been illustrated for a wide range of substrates and proceeded under basic reaction conditions using readily available materials in the absence of a transition-metal catalyst
Nucleophilic substitution at sulfonyl sulfur atom: Aminolysis of 1-tosyl-3-methyl imidazolium chloride in aqueous medium.
作者:Pierre Monjoint、Marie-Françoise Ruasse
DOI:10.1016/s0040-4039(01)91003-2
日期:1984.1
reactions. The activation parameters and the value of the brønsted exponent, β = 0.48, are consistent with a small degree of bonding between the entering amine and the sulfuratom in the transition state. Similarities in the nucleophilic behavior of sulfonyl and carbonyl groups are detected.
Silver-Catalyzed Domino Reaction of CF<sub>3</sub>-Substituted <i>N</i>-Allenamides with Primary Amines for the Construction of 2-Amido-5-fluoropyrroles
作者:Maxime Hourtoule、Laurence Miesch
DOI:10.1021/acs.orglett.3c00401
日期:2023.3.17
We report herein a domino reaction to construct 2-amido-5-fluoropyrroles from CF3-substituted N-allenamides. The in situ generated gem-difluorinated ene-ynamides derived from CF3-substituted N-allenamides, when subjected to silver catalysis with a primaryamine, undergo simultaneous hydroamination of the ynamide moiety followed by a 5-endo-trig addition/β-fluoride elimination sequence, enabling the
Topical formulation and method for preventing or treating acne
申请人:Wu Lester J.
公开号:US10548862B2
公开(公告)日:2020-02-04
Provided is a topical formulation for preventing or treating acne, including a benzenesulfonamide derivative, and a pharmaceutically or cosmetically acceptable excipient. Also provided is a method for preventing or treating acne, including applying the topical formulation on skin of a subject in need thereof.