Direct α-arylchalcogenation of acetone with diaryl dichalcogenides has been achieved by using a mixture of TBHP and DTBP oxidants at 120 °C without transition-metal catalyst via oxidativeC(sp3)–Hbond functionalization. The method exhibits good functional group tolerance and products were isolated in moderate to high yields.
Copper-Catalyzed Decarboxylative Oxyalkylation of Alkynyl Carboxylic Acids: Synthesis of γ-Diketones and γ-Ketonitriles
作者:Yi Li、Jia-Qi Shang、Xiang-Xiang Wang、Wen-Jin Xia、Tao Yang、Yangchun Xin、Ya-Min Li
DOI:10.1021/acs.orglett.9b00520
日期:2019.4.5
A novel copper-catalyzed decarboxylative oxyalkylation of alkynyl carboxylic acids with ketones and alkylnitriles via direct C(sp3)–H bond functionalization to construct new C–C bonds and C–O double bonds was developed. This transformation is featured by wide functionalgroup compatibility and the use of readily available reagents, thus affording a general approach to γ-diketones and γ-ketonitriles
Oxidation of various cyclic and acyclic ketones under mild conditions with chlorocatecholborane, a bulky pyridine base, and TEMPO to the corresponding α-aminoxylated products in good to excellent yields (52–99%) is described. For enones as substrates, products of a β-chloro-α-aminoxylation are obtained (70–89%).
Direct Acyl Radical Addition to 2<i>H</i>-Indazoles Using Ag-Catalyzed Decarboxylative Cross-Coupling of α-Keto Acids
作者:Ganganna Bogonda、Hun Young Kim、Kyungsoo Oh
DOI:10.1021/acs.orglett.8b00920
日期:2018.5.4
A direct acyl radical addition to 2H-indazoles has been achieved for the first time, where the less-aromatic quinonoid 2H-indazoles readily accepted radical species to the C-3 position. Motivated by the lack of direct acylation strategy for 2H-indazoles, the current method utilizes the radical acceptability of 2H-indazoles, discovering an ambient temperature reaction to provide facile access to a diverse
Metal-Free Oxidative Radical Addition of Carbonyl Compounds to α,α-Diaryl Allylic Alcohols: Synthesis of Highly Functionalized Ketones
作者:Xue-Qiang Chu、Hua Meng、You Zi、Xiao-Ping Xu、Shun-Jun Ji
DOI:10.1002/chem.201404463
日期:2014.12.15
A metal‐free directalkylation of simple carbonyl compounds (ketones, esters, and amides) with α,α‐diaryl allylic alcohols is described. The protocol provides facile access to highly functionalized dicarbonyl ketones by a radical addition/1,2‐aryl migration cascade. The regioselectivity of the reaction was precisely controlled by the nature of the carbonyl compound.