Photocatalyzed cascade oxidative annulation of propargylamines and phosphine oxides
作者:Zheng-Guang Wu、Xiao Liang、Jie Zhou、Lei Yu、Yi Wang、You-Xuan Zheng、Yu-Feng Li、Jing-Lin Zuo、Yi Pan
DOI:10.1039/c7cc02433a
日期:——
intermediate propargylamine serving as a new type of radical acceptors incorporating with P-radical via a photocatalytic strategy. This reaction proceeds through a cascade phosphinoylation/cyclization/oxidation/aromatization pathway using readily available starting materials under mild conditions of light with excellent atom economy, catalyzed by AgOAc or fac-Ir(ppy)3. One of the phosphorylated quinolines
A pyridine-bis(oxazoline) ligand was efficiently immobilized by copper(I)-catalyzed azide-alkyne cycloaddition onto a polystyrene resin. The so obtained click-pybox resin 1a was associated with various metal salts (YbCl3, LuCl3, CuOTf) and the resulting resin-bound catalysts were explored in ring-opening of cyclohexene oxide, silylcyanation of benzaldehyde and alkynylation of imines. These new polymer-supported
K<sub>2</sub>S<sub>2</sub>O<sub>8</sub>-Mediated Synthesis of Highly Functionalized Pyrroles via Oxidative Self-Dimerization of <i>N</i>-Propargylamines
作者:Bipin Kumar Behera、Archana Kumari Sahu、Ngangbam Renubala Devi、Anil K. Saikia
DOI:10.1021/acs.joc.1c00471
日期:2021.9.17
pentasubstituted pyrroles via oxidative self-dimerization of N-propargylamines catalyzed by silver benzoate in the presence of K2S2O8 in good yields. The protocol provides a simple route for the synthesis of both tetra- and pentasubstituted pyrroles with two carbonyl groups in the side chain. The methodology can be extended toward the synthesis of pyrrolo[3,4-d]pyridazine.
已经开发了一种有效的方法,用于在K 2 S 2 O 8存在下,通过苯甲酸银催化的N-炔丙胺的氧化自二聚以良好的产率合成四取代和五取代的吡咯。该协议为合成四取代和五取代吡咯在侧链中具有两个羰基提供了一种简单的途径。该方法可以扩展到吡咯并[3,4- d ]哒嗪的合成。
An efficient approach for 3-haloquinoline synthesis: PhI(OAc)2-mediated A3-X type tandem annulation of amine, aldehyde, alkyne and halide salt
molecules with diversity and complexity is urgent. Herein, a novel A3-X type reaction for functionalized 3-haloquinolines has been developed by PhI(OAc)2-mediated four-component tandem addition/cyclization/oxidation/aromatization process with simple aromaticamine, aldehyde, alkyne and halide salt. Broad functionalgroup tolerance, very mild condition, easy for further transformation illustrate the
Synthesis of Thiazole-2(3<i>H</i>)-ones via [3,3]-Sigmatropic Rearrangement/5-<i>exo</i>-dig Cyclization of <i>N</i>-Propargylamines
作者:Bipin Kumar Behera、Sudip Shit、Subhamoy Biswas、Anil K. Saikia
DOI:10.1021/acs.joc.2c00991
日期:2022.7.15
An efficient methodology has been developed for the synthesis of both di- and trisubstituted thiazol-2(3H)-ones from N-propargylamines and silver(I) trifluoromethanethiolate (AgSCF3) in good yields. The reaction proceeds via [3,3]-sigmatropic rearrangement/5-exo-dig cyclization of N-propargylamines. The starting material can be easily prepared from the A3-coupling reaction of amines, aldehydes, and
已经开发出一种有效的方法,用于从N-炔丙基胺和三氟甲硫醇银 (I) (AgSCF 3 ) 以良好的收率合成二取代和三取代的 thiazol-2(3 H )-ones。该反应通过N-炔丙基胺的 [3,3]-σ 重排/5- exo -dig 环化进行。起始材料可以很容易地由胺、醛和炔烃的 A 3 -偶联反应制备。该方法可以扩展到噻唑-2(3 H )-硫酮衍生物的合成,并对一些合成化合物的光物理性质进行了研究。