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.
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
Arylboration and arylsilylation reactions of N-(2-iodoaryl)acrylamides with bis(pinacolato)-diboron (B2pin2) or PhMe2Si-Bpin are developed by using simple CuOAc as the sole catalyst. A range of boron- or silane-bearing 3,3′-disubstituted oxindoles are obtained in moderate to excellent yields. The reaction is proposed to proceed via a domino sequence involvingintermolecular olefin borylcupration or silylcupration