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。
Catalyst-Free and Transition-Metal-Free Approach to 1,2-Diketones via Aerobic Alkyne Oxidation
A catalyst-free and transition-metal-free method for the synthesis of 1,2-diketones from aerobic alkyne oxidation was reported. The oxidation of various internal alkynes, especially more challenging aryl-alkyl acetylenes, proceeded smoothly with inexpensive, easily handled, and commercially available potassium persulfate and an ambient air balloon, achieving the corresponding 1,2-diketones with up
We report an electrochemical protocol for the direct oxidation of internal alkynes in air to provide 1,2-diketones. A variety of functional groups and heterocycle-containing substrates can be tolerated well under mild conditions.