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.
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。
Nickel-Catalyzed Reductive Aryl Thiocarbonylation of Alkene via Thioester Group Transfer Strategy
作者:Yunxia Feng、Shimin Yang、Shen Zhao、Dao-Peng Zhang、Xinjin Li、Hui Liu、Yunhui Dong、Feng-Gang Sun
DOI:10.1021/acs.orglett.0c02091
日期:2020.9.4
Herein reported is a nickel-catalyzed reductive aryl thiocarbonylation of alkenevia thioester group transfer strategy by using simple and readily available thioesters. In contrast to traditional activation of weaker C(acyl)–S bond, the C(acyl)–C bond of thioester was selectively cleaved to enable this reaction under mild conditions. Furthermore, this approach features operational simplicity and broad
Palladium‐Catalyzed Domino Synthesis of 2,3‐Difunctionalized Indoles
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Migratory Insertion of Isocyanides in Batch and Continuous Flow
作者:Su Chen、Monica Oliva、Luc Van Meervelt、Erik V. Van der Eycken、Upendra K. Sharma
DOI:10.1002/adsc.202100339
日期:2021.7
We report, herein, a palladium-catalyzed cascade comprising carbopalladation, migratoryinsertion of isocyanide and triple bond activation followed by a nucleophilic attack (OR−) to construct difunctionalized acyl indoles. The process involves multiple bond formations via key palladium-chemistry steps, to construct these bis-heterocycles containing two privileged scaffolds (indole and oxindole) in
An asymmetric palladium and copper co-catalyzed Heck/Sonogashira reaction between o-iodoacrylanilides and terminalalkynes to synthesize chiral oxindoles was developed. In particular, a wide range of CF3 -substituted o-iodoacrylanilides reacted with terminalalkynes, affording the corresponding chiral oxindoles containing trifluoromethylated quaternary stereogenic centers in high yields with excellent