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
Thiol activated prodrugs of sulfur dioxide (SO2) as MRSA inhibitors
作者:Kundansingh A. Pardeshi、Satish R. Malwal、Ankita Banerjee、Surobhi Lahiri、Radha Rangarajan、Harinath Chakrapani
DOI:10.1016/j.bmcl.2015.04.046
日期:2015.7
are becoming common worldwide and new strategies for drug development are necessary. Here, we report the synthesis and evaluation of 2,4-dinitrophenylsulfonamides, which are donors of sulfur dioxide (SO2), a reactive sulfur species, as methicillin-resistant Staphylococcus aureus (MRSA) inhibitors. N-(3-Methoxyphenyl)-2,4-dinitro-N-(prop-2-yn-1-yl)benzenesulfonamide (5e) was found to have excellent in
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。
Design and synthesis of novel 1,2,3-triazole derivatives of coronopilin as anti-cancer compounds
A series of 1,2,3-triazole coronopilin congeners have been designed and synthesized by employing click chemistry approach starting from parthenin and evaluated for their cytotoxicity against a panel of six human cancer cell lines (PC-3, THP-1, HCT-15, HeLa, A-549 and MCF-7). While many compounds exhibited significant anticancer activity, compound 3a, was found to be the most promising analogue in this
Rhodium-Catalyzed Asymmetric Hydroboration/Cyclization of 1,6-Enynes Enabled by Spirosiladiphosphine Ligands: Constructing Chiral Five-Membered Rings with a Boron Handle
A rhodium-catalyzed enantioselective hydroboration/cyclization reaction of 1,6-enynes is achieved by employing a spirosiladiphosphine ligand. The process allows the synthesis of five-membered hetero- and carbocycles bearing a boron handle with high levels of activity and selectivity. Various enynes and organoboranes (HBdan, HBpin, HBmp, and HBamm) have been accommodated, and enynes containing terminal