A catalytic enantioselective domino Heck carbonylation reaction of o-iodoacrylanilides with phenylacetylenes or water has been developed using a Pd/(Cu) catalytic system containing a chiral diphosphine ligand L9, furnishing a wide array of chiral β-carbonylated 3,3-disubstituted oxindoles in high yields with up to 99 % ee values.
The first Pd‐catalyzed domino Heck/phosphorylation of N‐(2‐iodophenyl)acrylamides with secondary phosphine oxides has been developed. The use of PdCl2 as a catalyst, 1,4‐bis(diphenylphosphino)butane as a ligand, K2CO3 as a base, various N‐(2‐iodophenyl)acrylamide derivatives are tolerant in this transformation, affording 3‐phosphinomethyl 3,3‐disubstituted oxindole products in good to excellent yields
N-(2-碘苯基)丙烯酰胺与仲膦氧化物的第一个Pd催化的多米诺Heck /磷酸化反应已经开发出来。在此转化过程中可以耐受使用PdCl 2作为催化剂,1,4-双(二苯基膦基)丁烷作为配体,K 2 CO 3作为碱,各种N-(2-碘苯基)丙烯酰胺衍生物,从而获得3-膦基甲基3,3-二取代的羟吲哚产品,收率良好至优异。这一转变为一步一步形成新的C-C和P-C键,羟吲哚环提供了一条直接途径。而且,该方法可轻松适用于大规模制备。
Domino Carbopalladation/CH Functionalization Sequence: An Expedient Synthesis of Bis-Heteroaryls through Transient Alkyl/Vinyl-Palladium Species Capture
作者:Upendra K. Sharma、Nandini Sharma、Yogesh Kumar、Brajendra K. Singh、Erik V. Van der Eycken
DOI:10.1002/chem.201503708
日期:2016.1.11
A microwave‐assisted highly efficient intermolecular domino carbopalladation/CHfunctionalization sequence has been developed to access bis‐heteroaryl frameworks in a single operation. The reaction involves carbopalladation of the halogenated acrylamides or phenylpropiolamides by the Pd(0) catalysis, followed by the direct (hetero)arylation to give products with good to excellent yields. The synthetic
微波辅助高效分子间多米诺carbopalladation / C ħ官能序列已经发展到访问双-杂芳基的框架在单次操作。该反应涉及通过Pd(0)催化使卤化丙烯酰胺或苯基丙酰胺的碳弹法反应,然后进行直接(杂)芳基化反应,从而获得具有良好收率或优异收率的产品。该方法的综合用途也扩展到了Ugi-加合物作为起始原料的应用。
Domino Heck/borylation sequence towards indolinone-3-methyl boronic esters: trapping of the σ-alkylpalladium intermediate with boron
作者:Dipak D. Vachhani、Himanshu H. Butani、Nandini Sharma、Umed C. Bhoya、Anamik K. Shah、Erik V. Van der Eycken
DOI:10.1039/c5cc05193b
日期:——
A suitable boron-complex has been used as a nucleophile to trap the σ-alkylpalladium intermediate for the synthesis of indolinone 3-methyl boronic esters, applying a domino Heck/borylation strategy.
Palladium-Catalyzed Domino Heck/Silylation Reaction for the Synthesis of (2-Oxoindolin-3-yl)methylsilanes <i>via</i>
Trapping of the σ-Alkylpalladium Intermediates with Disilanes
palladium‐catalyzed domino Heck/silylation reaction of acrylamides with hexamethyldisilane is presented. This transformation, which involves the formation of a σ‐alkylpalladium intermediate, allows direct access to functionalized (2‐oxoindolin‐3‐yl)methylsilanes in good to excellent yields. Furthermore, this strategy could be utilized for the synthesis of (2‐oxoindolin‐3‐yl)methylstannanes from hexamethyldistannane