Low Catalyst Loadings for Ligand-Free Copper(I)-Oxide-Catalyzed<i>N</i>-Arylation of Methanesulfonamide in Water
作者:Bryan Yong-Hao Tan、Yong-Chua Teo、Ai-Hua Seow
DOI:10.1002/ejoc.201301561
日期:2014.3
A simple and practical protocol for the cross-coupling of methanesulfonamide and aryl iodides under ligand-freecopper(I)-oxide-catalyzed conditions in water is reported. The method allows the preparation of a wide variety of synthetically useful N-arylated methanesulfonamides in good to excellent yields (up to 90 %) under the optimized conditions.
A mild and efficient procedure has been developed for the first time under biomimetic conditions for the monosulfonylation of various amines and aminoacids catalyzed by β-cyclodextrin in water at room temperature to afford the corresponding sulfonamides in high yields.
Palladium-Catalyzed Cascade sp<sup>2</sup> C–H Bond Functionalizations Allowing One-Pot Access to 4-Aryl-1,2,3,4-tetrahydroquinolines from <i>N</i>-Allyl-<i>N</i>-arylsulfonamides
palladium-catalyzed cascade reaction allowing an efficient synthesis of 4-aryl-1,2,3,4-tetrahydroquinolines from N-allyl-N-arylsulfonamides and benzenesulfonylchlorides. In this transformation, two C(sp2)–C(sp3) bonds were formed via activation of C(sp2)–H bonds. The reaction proceeds using the easily accessible catalyst PdCl2, with Li2CO3 as inexpensive base and CuBr as additive, and tolerates a wide variety of substituents
我们已经开发了钯催化的级联反应,可以从N-烯丙基-N-芳基磺酰胺和苯磺酰氯有效合成4-芳基-1,2,3,4-四氢喹啉。在此转换中,通过激活C(sp 2)-H键形成了两个C(sp 2)-C(sp 3)键。该反应使用容易获得的催化剂PdCl 2进行,其中Li 2 CO 3为廉价的碱,CuBr为添加剂,并且在两个反应伙伴上都可以耐受多种取代基。
Nucleophilic Aromatic Substitution of Unactivated Aryl Fluorides with Primary Aliphatic Amines by Organic Photoredox Catalysis
work, a mild and transition‐metal‐free approach for the nucleophilic aromatic substitution (SNAr) of unactivated fluoroarenes with primary aliphatic amines to form aromatic amines is reported. This reaction is facilitated by the formation of cationic fluoroarene radical intermediates in the presence of an acridinium‐based organic photocatalyst under blue‐light irradiation. Various electron‐rich and
Regio- and Stereoselective Hydrophosphorylation of Ynamides for the Synthesis of β-Aminovinylphosphine Oxides
作者:Hai Huang、Hongjun Zhu、Jun Yong Kang
DOI:10.1021/acs.orglett.8b01065
日期:2018.5.4
A metal-free hydrophosphorylation of ynamides with diaryl phosphine oxides has been developed. A highly E-selective and β-regioselective hydrophosphorylation protocol has been established as a general method for the synthesis of diversely hydrophosphinylated products employing an in situ generated electrophilic phosphorus species. Deuterium incorporation experiments suggest that the amino phosphirenium