Selective Monoarylation of Aromatic Ketones and Esters via Cleavage of Aromatic Carbon–Heteroatom Bonds by Trialkylphosphine Ruthenium Catalysts
作者:Hikaru Kondo、Takuya Kochi、Fumitoshi Kakiuchi
DOI:10.1021/acs.orglett.6b03761
日期:2017.2.17
We report here the ruthenium-catalyzed selective monoarylation of aromatic ketones bearing two ortho carbon–heteroatom (O or N) bonds. Under the newly developed catalyst system consisting of RuHCl(CO)(PiPr3)2, CsF, and styrene, the C–O arylation of 2′,6′-dimethoxyacetophenone with a phenylboronate gave the C–O monoarylation product selectively. The selective C–O monoarylation was applicable to a variety
我们在这里报告了钌催化的带有两个邻位碳-杂原子(O或N)键的芳族酮的选择性单芳基化。在由RuHCl(CO)(P i Pr 3)2,CsF和苯乙烯组成的新开发的催化剂体系下,2',6'-二甲氧基苯乙酮与苯基硼酸酯的C–O芳基化选择性地产生了C–O单芳基化产物。选择性C–O单芳基化反应适用于各种芳基硼酸酯和芳族酮,并具有较高的区域选择性和化学选择性。使用芳族酯的C–O单芳基化作为关键步骤,也可以实现正式的交替烯醇合成。
OXIDATIVE COUPLING OF ARYL BORON REAGENTS WITH SP3-CARBON NUCLEOPHILES, AND AMBIENT DECARBOXYLATIVE ARYLATION OF MALONATE HALF-ESTERS VIA OXIDATIVE CATALYSIS
申请人:The Governors of the University of Alberta
公开号:US20180186721A1
公开(公告)日:2018-07-05
Described herein are methods of oxidative coupling of aryl boron reagents with sp
3
-carbon nucleophiles, and ambient decarboxylative arylation of malonate half-esters via oxidative catalysis.
The Cu(I)-catalyzed ring-opening cross-coupling of an oxabicyclic olefin with an organoboron reagent provides access to cis-2-aryl-1,2-dihydronaphthalen-1-ol derivatives, in contrast to the exclusive trans-selectivity in related Cu-catalyzed reactions with Grignard reagents. DFT calculations suggest that the reaction possibly proceeds via boronic ester by-product assisted ring-opening as an alternative
a variety of allenic alcohols and 2,5‐dihydrofurans by rhodium(I)‐catalyzed arylative transformations of propargylic diols is reported. The hydroxorhodium catalyst was found to play dual role: it catalyzed the arylation/dehydroxylation reaction of propargylic diols to afford allenic alcohols, and besides, it could convert to a cationic rhodium species in situ, which catalyzed the intramolecular hydroalkoxylation
Oxidative Coupling of Aryl Boron Reagents with sp<sup>3</sup>-Carbon Nucleophiles: The Enolate Chan-Evans-Lam Reaction
作者:Patrick J. Moon、Heather M. Halperin、Rylan J. Lundgren
DOI:10.1002/anie.201510558
日期:2016.1.26
Reported is a versatile new oxidative method for the arylation of activated methylene species. Under mild reaction conditions (RT to 40 °C), Cu(OTf)2 mediates the selective coupling of functionalized aryl boron species with a variety of stabilized sp3‐nucleophiles. Tertiary malonates and amido esters can be employed as substrates to generate quaternary centers. Complementing either traditional cross‐coupling
报道了一种用于活化的亚甲基物质的芳基化的通用的新氧化方法。在温和的反应条件下(室温至40°C),Cu(OTf)2介导功能化的芳基硼物种与各种稳定的sp 3-亲核试剂的选择性偶联。丙二酸叔丁酯和酰胺基酯可用作底物以生成四元中心。作为传统交叉偶联或S N Ar方案的补充,在卤素亲电试剂(包括芳基溴化物和碘化物)存在下,该转化过程具有化学选择性。带有酰胺基,磺酰基基和膦酰基基团的底物不适合在温和的Hurtley型条件下偶联,是合适的反应伙伴。