Nature of the Nucleophilic Oxygenation Reagent Is Key to Acid-Free Gold-Catalyzed Conversion of Terminal and Internal Alkynes to 1,2-Dicarbonyls
作者:Alexey Yu. Dubovtsev、Nikolay V. Shcherbakov、Dmitry V. Dar’in、Vadim Yu. Kukushkin
DOI:10.1021/acs.joc.9b02785
日期:2020.1.17
2,3-Dichloropyridine N-oxide, a novel oxygen transfer reagent, allows the conductance of the gold(I)-catalyzed oxidation of alkynes to 1,2-dicarbonyls in the absence of any acid additives and undermildconditions to furnish the target species, including those derivatized by highly acid-sensitive groups. The developed strategy is effective for a wide range of alkyne substrates such as terminal- and
Synthesis of 1,2-Diketones via a Metal-Free, Visible-Light-Induced Aerobic Photooxidation of Alkynes
作者:Xu Liu、Tiantian Cong、Ping Liu、Peipei Sun
DOI:10.1021/acs.joc.6b00097
日期:2016.8.19
1,2-Diketones were synthesized by the oxidation of corresponding alkynes using air as the oxidant under metal-free conditions upon irradiation of blue light. A cheap and readily available organic dye, eosin Y, was used as the photocatalyst. For various substituents on the aryl ring, the reaction proceeded smoothly to give the dicarbonylation products in moderate to good yields. Some oxidation-sensitive
Reductive (3 + 2) Annulation of Benzils with Pyrylium Salts: Stereoselective Access to Furyl Analogues of <i>cis</i>-Chalcones
作者:Pengwei Tan、Sunewang R. Wang
DOI:10.1021/acs.orglett.9b02182
日期:2019.8.2
An unprecedented reductive (3 + 2) annulation of both symmetrical and unsymmetrical benzils with pyryliumsalts mediated by P(NMe2)3 is described, leading to facile and stereoselective access to the challenging cis-chalcones decorated by various substituted furyl rings under mild conditions. Rather than the extensively studied C1 synthons, the Kukhtin–Ramirez adducts derived from benzils serve as the
A practical access to 1,2-dicarbonyls via oxidation of alkynes catalyzed by gold(I) immobilized on MCM-41
作者:Jiajun Zeng、Jianying Li、Bin Huang、Jiajia Li、Mingzhong Cai
DOI:10.1016/j.jorganchem.2022.122435
日期:2022.10
gold(I)-catalyzed oxidation of alkynes was achieved by using 2,3-dichloropyridine N-oxide as oxidant and MCM-41-anchored diphenylphosphine-gold(I) complex [MCM-41-Ph2P-AuNTf2] as the catalyst under mild and acid-free conditions, yielding diverse 1,2-dicarbonyls in good to excellent yields with easy recycling of the gold catalyst. The developed method is applicable to a wide variety of alkynes including internal
Molecular Iodine Mediated Oxidation of Arylated α‐Carbonyl Sulfoxonium Ylides to 1,2‐Dicarbonyl‐Containing Compounds
作者:Radell Echemendía、Matheus P. De Jesus、Lucas G. Furniel、David Philip Day、Antonio C. B. Burtoloso
DOI:10.1002/ejoc.202200441
日期:2022.7.14
Iodine in action: A fast and efficient method to construct 1,2-dicarbonyl compounds from molecular Iodine and prochiral sulfoxonium ylides. A variety of decorated 1,2-dicarbonyl compounds were prepared with molecular iodine and aryl substituted sulfoxonium ylides.Molecular iodinemediatedoxidation of arylated α-carbonyl sulfoxonium ylides to 1,2-dicarbonyl containing compounds