Thiophenol-Mediated 1,5-Hydrogen Transfer for the Preparation of Pyrrolizidines, Indolizidines, and Related Compounds
作者:Fabrice Dénès、Florent Beaufils、Philippe Renaud
DOI:10.1021/ol702017t
日期:2007.10.1
The efficient preparation of 1-azabicyclic alkanes is described. Highly functionalized skeletons are prepared in a concise manner using a radical tin-free 1,5-hydrogen transfer-cyclization process. The precursors for the radical reactions are readily assembled either from pyrrolidine/piperidine/hexahydro-1H-azepine or via condensation of a properly designed N-alkylimine with an allenylzinc species
Bis(methoxycarbonyl)carbene Insertion into N-H Bonds: A Facile Route to<i>N</i>-Substituted Aminomalonic Esters
作者:Suren Husinec、Ivan Juranic、Antonia Llobera、Alexander E. A. Porter
DOI:10.1055/s-1988-27687
日期:——
Bis(methoxycarbonyl)carbene, generated by the copper(II)-catalyzed fragmentation of 2,5-dichlorothiophenium-1-bis(methoxycarbonyl) methylide (3) undergoes rapid and efficient insertion into the N-H bonds of primary and secondary amines to generate N-substituted aminomalonic esters in good to excellent yields.
Visible-light photocatalytic radical addition–translocation–cyclization to construct sulfonyl-containing azacycles
作者:Yu-Qing Liang、Yi-Xin Xu、Zhong-Jian Cai、Shun-Jun Ji
DOI:10.1039/d2cc03799h
日期:——
visible-light photocatalytic radical addition–translocation–cyclization (RATC) approach for the efficient synthesis of sulfonyl-containing azacycles is described. The reaction delivers a wide range of monocyclic, bicyclic and polycyclic azacycles by using easily prepared sodium sulfinates and N-homopropargylic amines as starting materials. Instead of the traditionally used toxic tin reagents and thermally hazardous
General Ir-Catalyzed N–H Insertions of Diazomalonates into Aliphatic and Aromatic Amines
作者:Zhuang Zhong、Céline Besnard、Jérôme Lacour
DOI:10.1021/acs.orglett.3c03929
日期:2024.2.9
reactivity of acceptor–acceptor diazo malonate reagents is reported using [Ir(cod)Cl]2 as catalyst. A large range of amines, primary and secondary, aliphatic and aromatic, is possible. Mild temperatures, perfect substrate/reactant stoichiometry, and good functional group compatibility render the process particularly attractive for the (late-stage) functionalization of amines.