An Unprecedented Pd-Catalyzed, Water-Promoted Sequential Oxidative Aminocarbonylation−Cyclocarbonylation Process Leading to 2-Oxazolidinones
摘要:
An unprecedented, PdI2-catalyzed, sequential oxidative aminocarbonylation-cyclocarbonylation process, leading to 2-oxazolidinone derivatives 3 in good to excellent yields starting from readily available alpha,alpha-disubstituted 2-ynylamines 1 and secondary amines 2, is reported. In the case of an alpha-monosubstituted substrate, the initially formed 2-oxazolidinone derivative underwent shift of the double bond to give a 3H-oxazol-2-one derivative in excellent isolated yield.
The reaction of acetylenic amines 1 with electrochemically generated tetraethylammonium carbonate (TEAC) or chemically generated tetraethylammonium hydrogen carbonate (TEAHC) is reported. Unsubstituted or substituted 5-methylene-1,3-oxazolidin-2-ones 2 are obtained in moderate to very high yields according to the reaction conditions adopted and to the nature of the substrate.
An efficient electrochemical synthesis of 5-methylene-1,3-oxazolidin-2-ones (2a−h) fromacetylenicamines (1a−h) and carbon dioxide has been achieved by direct electrolysis of solution of MeCN and Et4NPF6 containing the amine, with subsequent CO2 bubbling and heating. The yields vary from good to excellent, the conditions are mild, and the use of toxic and harmful chemicals and catalysts is avoided
的5-亚甲基-1,3-恶唑烷-2-酮(一种有效的电化学合成2A - ħ从炔胺()1A - H ^)和二氧化碳已经通过的MeCN和Et的溶液直接电解来实现4 NPF 6含有胺,随后鼓入CO 2并加热。收率各有不同,条件温和,避免使用有毒有害的化学物质和催化剂。
Copper/DTBP-Promoted Oxyselenation of Propargylic Amines with Diselenides and CO<sub>2</sub>: Synthesis of Selenyl 2-Oxazolidinones
作者:Jia-Min Chen、Lin Qi、Linlin Zhang、Li-Jun Li、Cong-Ying Hou、Wei Li、Li-Jing Wang
DOI:10.1021/acs.joc.0c01519
日期:2020.8.21
A highly efficient electrophilic oxyselenation of propargylic amines with diselenides and CO2 under atmospheric pressure promoted by copper/DTBP is reported. Various biologically important selenyl 2-oxazolidinones were produced in moderate to excellent yields. The developed method features a broad substrate scope, easy scalability, and mild reaction conditions.
Silylformylation–desilylation of propargyl amides: synthesis of α,β-unsaturated aldehydes
作者:Laura Antonella Aronica、Patrizio Raffa、Giulia Valentini、Anna Maria Caporusso、Piero Salvadori
DOI:10.1016/j.tetlet.2005.11.054
日期:2006.1
α,β-Unsaturated aldehydes are prepared from easily available propargyl amides through a two-step sequence of silylformylation–desilylation reactions. The substituent on the nitrogen atom markedly influences both reactions, β-silylalkenals being formed in the presence of tosyl or tert-butoxycarbonyl protected amines. TBAF is employed to induce the desilylation process that is performed under very mild
Versatile synthesis of beta-lactams, gamma-lactams or oxalines by palladium-catalysed oxidative carbonylation of 1-substituted prop-2-ynylamines
作者:Alex Bonardi、Mirco Costa、Bartolo Gabriele、Giuseppe Salerno、Gian Paolo Chiusoli
DOI:10.1016/0040-4039(95)01514-0
日期:1995.10
alfa-Methylene-beta-lactams possessing a Z-alkoxycarbonyl group are formed directly from the reaction of N-alkyl-substituted prop-2-ynylamines with CO, air and alcohols, under the catalytic action of palladium on carbon in conjunction with potassium iodide, while gamma-lactams or oxazolines are obtained with unsubstituted or acylated amines.