Ruthenium-Catalyzed Cascade CH Functionalization of Phenylacetophenones
作者:Vaibhav P. Mehta、José-Antonio García-López、Michael F. Greaney
DOI:10.1002/anie.201309114
日期:2014.2.3
orthogonal cascade CH functionalization processes are described, based on ruthenium‐catalyzedCH alkenylation. 1‐Indanones, indeno indenes, and indeno furanones were accessed through cascade pathways by using arylacetophenones as substrates under conditions of catalytic [Ru(p‐cymene)Cl2}2] and stoichiometric Cu(OAc)2. Each transformation uses CH functionalization methods to form CC bonds sequentially
描述了基于钌催化的C H 烯基化的三个正交级联 C H 官能化过程。在催化[Ru( p-伞花烃)Cl 2 } 2 ]和化学计量的Cu(OAc) 2条件下,使用芳基苯乙酮作为底物,通过级联途径获得1-茚满酮、茚并茚和茚并呋喃酮。每个转化均使用CH功能化方法顺序形成CC键,茚并呋喃酮合成以CO键形成为终止步骤。这项工作展示了钌催化烯基化作为平台反应开发更复杂转化的能力,在单个操作中发生多个C - H官能化步骤以获得新型碳环结构。
Palladium-Catalyzed Synthesis of Diarylmethanes: Exploitation of Carbanionic Leaving Groups
作者:Jason R. Schmink、Nicholas E. Leadbeater
DOI:10.1021/ol900874z
日期:2009.6.18
novel route to the synthesis of diarylmethanes via a Pd-catalyzed α-arylation of benzyl ketones is reported. By harnessing the inherent reactivity of enolates, it is possible to circumvent the need for a transmetalating reagent such as boron for the coupling. Additionally, the two phenyl rings of the intermediate are exploited to stabilize the high-energy carbanionic leavinggroup in a straightforward
The present invention provides apalladium(II)complex of formula (1) or a palladium(II) complex of formula (2). R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R18, R19, R20, R21, R22, R23 and R24, m, E and X are described in the specification. The invention also provides a process for the preparation of the complexes, and their use in carbon-carbon and carbon-heteroatom coupling reactions.
Non- and deactivated chloroarenes can be coupled with a wide range of ketones to yield the corresponding arylmethyl ketones in good to excellent yields using a palladium(II) acetate/n-BuPAd2 catalyst system. Depending on the ketone, the chloroarene/ketone ratio and the base, mono or diarylation can be effected selectively.
Lewis Acid-Promoted Friedel−Crafts Alkylation Reactions with α-Ketophosphate Electrophiles
作者:Austin G. Smith、Jeffrey S. Johnson
DOI:10.1021/ol100410k
日期:2010.4.16
The BF3·OEt2-promoted nucleophilicsubstitution of α-aryl-α-ketophosphates to afford α,α-diaryl ketone products is described. Electron-rich α-ketophosphates perform best, with electron-neutral and electron-poor substrates also tolerated. The reaction is tolerant of a range of aromatic, heteroaromatic, and nonaromatic nucleophiles, with yields ranging from 44% to 84%. Enantioenriched starting material
描述了BF 3 ·OEt 2促进的α-芳基-α-酮磷酸盐的亲核取代,以提供α,α-二芳基酮产物。富含电子的α-酮磷酸酯的性能最佳,同时还可以耐受电子中性和贫电子的底物。该反应可耐受多种芳族,杂芳族和非芳族亲核试剂,收率范围为44%至84%。富含对映体的原料产生外消旋产物,表明通过酰基carb离子的S N 1途径。