An expedient [5 + 1] annulation method via Rh(III)-catalyzed C–H bond functionalization of enaminones to synthesize polyaromatic rings is described. The reaction tolerates a broad range of functional groups and offers a new entry to construct polycyclic aromatic compounds with amino and formyl substituents. A possible reaction mechanism was proposed based on the results obtained from isotope labeling
Enantiomeric products formed via different mechanisms: asymmetric hydrogenation of an α,β-unsaturated carboxylic acid involving a Ru(CH3COO)2[(R)-binap] catalyst
Hydrogenation of (Z)-3-phenyl-2-butenoic acid with a Ru(CH3COO)2[(R)-binap] (BINAP=2,2′-bis(diphenylphosphino)-1,1′-binaphthyl) catalyst in methanol gives (S)-3-phenyl-2-butanoic acid and its R enantiomer in a 97:3 (4 atm) to 94:6 (100 atm) ratio in quantitative yield. Both hydrogen gas and protic methanol participate in the saturation of the olefinic bond. Analysis of the products obtained using
Regioselective synthesis of piperidinones by metal-catalyzed ring expansion-carbonylation reactions. Remarkable cobalt and/or ruthenium carbonyl catalyzed rearrangement and cyclization reactions
作者:Ming De Wang、Howard Alper
DOI:10.1021/ja00044a010
日期:1992.8
Carbonylation of pyrrolidines, catalyzed by cobaltcarbonyl, results in the formation of piperidinones. The reaction is regiospecific in most cases, and the yield of product is increased when rutheniumcarbonyl is present as a second catalyst. The dual catalytic system [Co 2 (CO) 8 /Ru 3 (CO) 12 ] is useful for the novel rearrangement of heterocyclic nitrogen ketones ((CH 2 ) n NCH 2 COR, n=4-7] to
Efficient 2-Aryl Benzothiazole Formation from Aryl Ketones and 2-Aminobenzenethiols under Metal-Free Conditions
作者:Yunfeng Liao、Hongrui Qi、Shanping Chen、Pengcheng Jiang、Wang Zhou、Guo-Jun Deng
DOI:10.1021/ol302902e
日期:2012.12.7
2-Aryl benzothiazole formationfrom aryl ketones and 2-aminobenzenethiols under metal- and I2-free conditions was described. Various 2-aryl benzothiazoles were selectively obtained in good yields using molecular oxygen as oxidant. DMSO played an important role in this transformation. Functional groups such as methyl, methoxy, fluoro, chloro, bromo and nitro groups were tolerated under the optimized reaction
Decarboxylative [4+2] annulation of arylglyoxylic acids with internal alkynes using the anodic ruthenium catalysis
作者:Mu-Jia Luo、Ting-Ting Zhang、Fang-Jun Cai、Jin-Heng Li、De-Liang He
DOI:10.1039/c9cc03210j
日期:——
A new electrochemical decarboxylative [4+2] annulation of arylglyoxylic acids with internal alkynes involving C–H functionalization by means of a cooperative anode and ruthenium catalysis is presented. This reaction represents a mechanistically novel strategy as an ideal supplement to the decarboxylative [4+2] annulation methodology by employing an electrooxidative process to avoid the use of an additional
提出了一种新的芳基乙醛酸与内部炔烃的电化学脱羧[4 + 2]环合反应,涉及通过协同阳极和钌催化的C–H官能化。通过采用电氧化工艺避免使用额外的外部氧化剂并利用H 2 O作为要结合的羧基氧原子源,该反应代表了一种机械新颖的策略,是脱羧[4 + 2]环化方法的理想补充在合成1 H -isochromen-1-ones中。