Catalyst-Controlled Highly Selective Coupling and Oxygenation of Olefins: A Direct Approach to Alcohols, Ketones, and Diketones
作者:Yijin Su、Xiang Sun、Guolin Wu、Ning Jiao
DOI:10.1002/anie.201303917
日期:2013.9.9
Oxygen? That's radical! A method for the direct synthesis of substituted alcohols, ketones, and diketones through a catalyst‐controlled highly chemoselective coupling and oxygenation of olefins has been developed. The method is simple and practical, can be switched by the selection of different catalysts, and employs molecular oxygen as both an oxidant and a reagent.
the visible light induced simple copper(II) chloride catalyzedoxidation of diarylacetylenes to α-diketones by molecular oxygen at roomtemperature. The in situ generated copper(II)-superoxo complex is a light-absorbing species that oxidizes inert diarylacetylenes to α-diketones. In contrast to reported photochemical processes, the current oxidation protocol does not require any exogenous photocatalyst
Mild Mn(OAc)<sub>3</sub>-Mediated Aerobic Oxidative Decarboxylative Coupling of Arylboronic Acids and Arylpropiolic Acids: Direct Access to Diaryl 1,2-Diketones
作者:Wen-Xin Lv、Yao-Fu Zeng、Shang-Shi Zhang、Qingjiang Li、Honggen Wang
DOI:10.1021/acs.orglett.5b01265
日期:2015.6.19
A simple and efficient method for the synthesis of diaryl 1,2-diketones has been developed. The reaction represents the first example of diaryl 1,2-diketones that are synthesized directly from arylboronic acids and arylpropiolicacids by a radical pathway in moderate to good yields. This reaction proceeds under mild reaction conditions and with good tolerance of a variety of functional groups. Preliminary
Copper-Catalyzed Direct Synthesis of Diaryl 1,2-Diketones from Aryl Iodides and Propiolic Acids
作者:Hongkeun Min、Thiruvengadam Palani、Kyungho Park、Jinil Hwang、Sunwoo Lee
DOI:10.1021/jo501089k
日期:2014.7.3
via the direct decarboxylativecoupling reaction of aryl propiolicacids and their oxidation. The optimized conditions are that the reaction of aryl propiolicacids and aryl iodides is conducted at 140 °C for 6 h in the presence of 10 mol % CuI/Cu(OTf)2 and Cs2CO3, after which HI (aq) is added and further reacted. The method shows good functional group tolerance toward ester, aldehyde, cyano, and nitro
通过芳基丙酸的直接脱羧偶联反应及其氧化反应合成苯甲醚衍生物,例如二芳基1,2-二酮。优化的条件是在10 mol%CuI / Cu(OTf)2和Cs 2 CO 3的存在下,芳基丙酸和芳基碘化物的反应在140°C下进行6 h ,之后HI(aq)为加入并进一步反应。该方法显示出对酯,醛,氰基和硝基的良好官能团耐受性。另外,在钯和铜催化剂的存在下,从芳基碘化物和丙酸获得对称的二芳基1,2-二酮。
Cobalt(<scp>ii</scp>) catalyzed C(sp)–H bond functionalization of alkynes with phenyl hydrazines: facile access to diaryl 1,2-diketones
作者:Jaideep B. Bharate、Sheenu Abbat、Rohit Sharma、Prasad V. Bharatam、Ram A. Vishwakarma、Sandip B. Bharate
DOI:10.1039/c5ob00419e
日期:——
A cobalt acetylacetonate catalyzed oxidative diketonation of alkynes via C(sp)–H bond functionalization has been described. The reaction involves a free-radical mechanism, wherein the phenyl radical formed from phenyl hydrazine couples with Co(II) activated alkyne to produce 1,2-diketones. The reaction proceeds at room temperature in DMF with the use of Ag2O/air as the oxidizing system. The utility
已经描述了乙酰丙酮钴通过C(sp)–H键官能化催化炔烃的氧化二酮化反应。该反应涉及自由基机理,其中由苯基肼形成的苯基与Co(II)活化的炔烃偶合以产生1,2-二酮。反应在室温下在DMF中使用Ag 2 O /空气作为氧化体系进行。已证明该方案可用于合成一系列咪唑类化合物,其中包括有效的血小板凝集抑制剂曲非那格雷。