Chemoselective One-Pot Synthesis of Functionalized Amino-azaheterocycles Enabled by COware
作者:Thomas A. Clohessy、Alastair Roberts、Eric S. Manas、Vipulkumar K. Patel、Niall A. Anderson、Allan J. B. Watson
DOI:10.1021/acs.orglett.7b03214
日期:2017.12.1
Functionalized bicyclic amino-azaheterocycles are rapidly accessed in a one-pot cross-coupling/reduction sequence enabled by the use of COware. Incompatible reagents are physically separated in a single reaction vessel to effect two chemoselective transformations—Suzuki–Miyaura cross-coupling and heteroarene reduction. The developed method allows access to novel heterocyclic templates, including semisaturated
O2. In the dehydrogenation of −CH2–OH to −CH═O, the formation of C══C and C═N bonds via concurrent cross-condensation, and the transformation of C═C/C═N to C–C/C–N via hydrogen transfer, ethanol dehydrogenation has been found to be the rate-determining step. Reducing the Ni particle size effectively increases the number of surface Niδ+ sites, which accelerates catalytic dehydrogenation through synergistic
Visible light-mediated Smiles rearrangements and annulations of non-activated aromatics
作者:Connor A. Lawson、Andrew P. Dominey、Glynn D. Williams、John A. Murphy
DOI:10.1039/d0cc04666c
日期:——
We report the first examples of radical cation Smiles rearrangements. A series of aryloxy alkylamines underwent spontaneous reaction, with the amino group displacing the ipso-alkoxy group through substitution, at ambient temperature and under photoactivation by visible light in the presence of an acridinium catalyst (5 mol%). The study was extended to 3-(2-methoxyphenyl)propan-1-amine derivatives,
Transfer hydrogenation of pyridinium and quinolinium species using ethanol as a hydrogen source to access saturated N-heterocycles
作者:Suman Yadav、Dhananjay Chaudhary、Naveen Kumar Maurya、Dharmendra Kumar、Km Ishu、Malleswara Rao Kuram
DOI:10.1039/d2cc00241h
日期:——
Catalytic transfer hydrogenation (TH) for the reduction of heterocycles is an emerging strategy for accessing biologically active saturated N-heterocycles. Herein, we report a TH protocol that utilizes ethanol as a renewable hydrogen source and an Ir catalyst for the reduction of quinolines and pyridines. The reaction is promoted by simple amides as ligands.
用于还原杂环的催化转移氢化 (TH) 是获得具有生物活性的饱和 N-杂环的新兴策略。在此,我们报告了一种 TH 协议,该协议利用乙醇作为可再生氢源和 Ir 催化剂来还原喹啉和吡啶。该反应通过简单的酰胺作为配体来促进。
A trifluoromethanesulfonic acid-catalyzed reaction of arylhydrazines with benzene
作者:Toshiharu Ohta、Shinji Miyake、Koichi Shudo
DOI:10.1016/s0040-4039(00)98933-0
日期:——
Arylhydrazines reacted with benzene in the presence of trifluoromethanesulfonic acid (TFSA) to give aminobiphenyls. This is a general method for the synthesis of aminobiphenyls.