A Versatile Tripodal Cu(I) Reagent for C–N Bond Construction via Nitrene-Transfer Chemistry: Catalytic Perspectives and Mechanistic Insights on C–H Aminations/Amidinations and Olefin Aziridinations
作者:Vivek Bagchi、Patrina Paraskevopoulou、Purak Das、Lingyu Chi、Qiuwen Wang、Amitava Choudhury、Jennifer S. Mathieson、Leroy Cronin、Daniel B. Pardue、Thomas R. Cundari、George Mitrikas、Yiannis Sanakis、Pericles Stavropoulos
DOI:10.1021/ja503869j
日期:2014.8.13
intermediates play a major role and are generated by hydrogen-atom abstraction from substrate C-H bonds or initial nitrene-addition to one of the olefinic carbons. Subsequent processes include solvent-caged radical recombination to afford the major amination and aziridination products but also one-electron oxidation of diffusively free carboradicals to generate amidination products due to carbocation
Is the Electrophilicity of the Metal Nitrene the Sole Predictor of Metal-Mediated Nitrene Transfer to Olefins? Secondary Contributing Factors as Revealed by a Library of High-Spin Co(II) Reagents
Recent research has highlighted the key role played by the electron affinity of the active metal-nitrene/imido oxidant as the driving force in nitreneadditions to olefins to afford valuable aziridines. The present work showcases a library of Co(II) reagents that, unlike the previously examined Mn(II) and Fe(II) analogues, demonstrate reactivity trends in olefin aziridinations that cannot be solely
Novel derivatives of enfumafungin are disclosed herein, along with their pharmaceutically acceptable salts, hydrates and prodrugs. Also disclosed are compositions comprising such compounds, methods of preparing such compounds and methods of using such compounds as antifungal agents and/or inhibitors of (l,3)-β-D-glucan synthase. The disclosed compounds, their pharmaceutically acceptable salts, hydrates and prodrugs,,as well as compositions comprising such compounds, salts, hydrates and prodrugs, are useful for treating and/or preventing fungal infections and associated diseases and conditions.
Enantioselective route to key intermediates in the synthesis of carbocyclic phosphoribosyltransferase transition state analogues
作者:Mohammad Ahmadian、Naveen K. Khare、James M. Riordan、Anthony E. Klon、David W. Borhani
DOI:10.1016/s0040-4020(01)00968-1
日期:2001.12
The enantioselective preparation of keyintermediates in the synthesis of transition state analogues of hypoxanthine-guanine phosphoribosyltransferase, (1S,2S,3R,4R)-4-acetoxymethyl-1-bromomethyl-2,3-isopropylidenedioxy-1-toluenesulfonamidocyclopentane (3a) and the 4-nitrobenzenesulfonamido analogue (3b), are described.
Nanocrystalline zinc peroxide mediated unprecedented nitrene transfer: an expeditious access to N-tosylaziridines
作者:Sanny Verma、Suman L. Jain
DOI:10.1039/c3ra43878c
日期:——
An unprecedented zinc peroxide (ZnO2) assisted synthetic strategy is reported for the synthesis of N-tosylaziridines from alkenes by using N-tosyliminotriphenylphosphorane (Ph3PNTs) as a nitrene transfer reagent under mild reaction conditions. The reaction of zinc peroxide with Ph3PNTs yielded a zinc oxaziridine intermediate which subsequently reacts with alkenes to give corresponding N-tosylaziridines in high to excellent yields.