Electron-transfer photocatalysis triggers selective fragmentation of a C−Cl bond of chlorodifloroacetic anhydride (CDFAA) generating a gem-difluoroalkyl radical intermediate. In the presence of olefin and under solvent-controlled reaction conditions, a notable synthetic divergence is achieved to access a wide array of gem-difluoro compounds.
Highly Enantioselective Organocatalytic Carbonyl-Ene Reaction with Strongly Acidic, Chiral Brønsted Acids as Efficient Catalysts
作者:Magnus Rueping、Thomas Theissmann、Alexander Kuenkel、René M. Koenigs
DOI:10.1002/anie.200802139
日期:2008.8.25
An Aliphatic Bischler–Napieralski Reaction: Dihydropyridones by Cyclocarbonylation of 3-Allylimidazolidin-4-ones
作者:Mostafa M. Amer、Olatz Olaizola、Jennifer Carter、Hossay Abas、Jonathan Clayden
DOI:10.1021/acs.orglett.9b04250
日期:2020.1.3
with potassium iodide led to cyclization of the allylic substituent onto the carbonyl group in an intramolecular aliphatic Friedel-Crafts-type acylation that corresponds to an aliphatic Bischler-Napieralskireaction. The product 3,4-dihydropyridinones were amenable to further functionalization, and finally hydrolysis, to deliver a series of enantio-enriched pipecolic acid derivatives.
Synthesis of <i>N</i>-Tosyl Allylic Amines from Substituted Alkenes via Vanadoxaziridine Catalysis
作者:Rufai Madiu、Erin L. Doran、Jenna M. Doran、Ali A. Pinarci、Kiran Dhillon、Dominic A. Rivera、Amari M. Howard、James L. Stroud、Dylan A. Moskovitz、Steven J. Finneran、Alyssa N. Singer、Morgan E. Rossi、Gustavo Moura-Letts
DOI:10.1021/acs.joc.3c02859
日期:2024.3.15
Herein, we report the catalytic allylic amination of α-methylalkenes with V2O3Dipic2(HMPA)2 and chloramine T as the quantitative source of N. The reaction works with high yields and stereoselectivities for α-methylalkenes. A proposed tosylnitrene-free catalytic cycle involving the formation of vanadoxaziridine complex 1 as the active catalyst and aminovanadation across the substrate as the rate-determining
在此,我们报道了以V 2 O 3 Dipic 2 (HMPA) 2和氯胺T作为N定量源的α-甲基烯烃的催化烯丙基胺化反应。该反应对 α-甲基烯烃具有高产率和立体选择性。提出了一种不含甲苯磺酰氮的催化循环,涉及形成钒氧氮丙啶配合物1作为活性催化剂,并通过底物进行氨基钒化作为限速步骤。初始动力学和竞争实验为所提出的机制提供了证据。