Synthesis of Substituted 3-Indolylimines and Indole-3-carboxaldehydes by Rhodium(II)-Catalyzed Annulation
作者:Basker Rajagopal、Chih-Hung Chou、Ching-Cheng Chung、Po-Chiao Lin
DOI:10.1021/ol501618z
日期:2014.7.18
3-indolylimines from N-propargylanilines through Rh(II)-catalyzed denitrogenative annulation of N-sulfonyl-1,2,3-triazoles. Further combined with hydrolysis or reduction, a one-pot method is developed to enable the direct incorporation of an imine, aldehyde, or amine group into an indole system from an alkyne. A variety of substituted 3-indolylimines, indole-3-carboxaldehydes, and 3-Indolylmethanamines are
Stereospecific Cu-catalyzed nucleophilic ringopening of N-sulfonylaziridines with propargylamines and subsequent hydroamination afford piperazines, which leads to double-bond isomerization to furnish tetrahydropyrazines. Optically active aziridines can be cross-coupled with high enantiomeric purities (>98% ee).
One-pot preparation of pyrrole derivatives via the copper-catalyzed [4+1] annulation of propargylic amines with ethyl glyoxylate and phenylglyoxal in the presence of piperidine
We describe how copper(II) chloride efficiently catalyzes the [4+1] annulation of propargylamines with either ethyl glyoxylate or phenylglyoxal functioning as a C1 unit, in the presence of piperidine, which leads to a straightforward and one-pot preparation of pyrrolederivatives. The key feature in this annulation is the in-situ generation of an N,O-hemiacetal intermediate from either the glyoxylate
Ag-Catalyzed or Ag/PPh<sub>3</sub>-Catalyzed Chemoselective Switchable Cascade Reactions of <i>N</i>-Propargyl Thiocarbamoyl Fluorides and Malonate Esters
作者:Zhongliang Cai、Junyi Zhou、Miao Yu、Liqin Jiang
DOI:10.1021/acs.orglett.1c03950
日期:2022.1.14
The divergent chemoselective synthesis of 2-methylene-2,3-dihydrothiazoles and 4-benzylidene pyrrolidine-2-thiones (most with E stereoselectivity) from N-propargyl thiocarbamoyl fluorides and malonate esters in moderate to excellent yields with a broad substrate scope and functional group tolerance has been accomplished. AgNTf2 catalyst at 60 °C in dichloroethane provided 4-benzylidene pyrrolidine-2-thiones
从N-炔丙基硫代氨基甲酰氟和丙二酸酯以中等至优异的产率,具有广泛的底物范围和功能性,不同的化学选择性合成 2-亚甲基-2,3-二氢噻唑和 4-亚苄基吡咯烷-2-硫酮(大多数具有 E 立体选择性)群体容忍度已经完成。AgNTf 2催化剂在 60 °C 下在二氯乙烷中提供 4-亚苄基吡咯烷-2-硫酮。AgOTf 催化剂和 PPh 3配体在回流乙腈中导致形成的 α,α-二酯硫代酰胺中间体的反应性发生完全转换,随后异构化得到 2-亚甲基-2,3-二氢噻唑。
A Microwave-Assisted Three-Component Synthesis of Arylaminomethyl Acetylenes: A Facile Access to Terminal Alkynes
作者:Yubo Jiang、Shaojun Huang
DOI:10.1055/s-0033-1340331
日期:——
A simple, rapid, one-pot synthesis of arylaminomethyl acetylenes is achieved undermicrowave-assistedconditions (power = 5 W) using aromatic boronic acids, aqueous ammonia, propargyl halides, copper(I) oxide and water as the solvent. The reactions are complete within ten minutes affording good to excellent yields of the products.