AgF/TFA-promoted highly efficient synthesis of α-haloketones from haloalkynes
摘要:
A AgF/TFA-promoted highly efficient synthesis of a wide range of alpha-haloketones from haloalkynes is described. The reactions are conducted under convenient conditions and provide products in moderate to excellent yields, with broad substrate scope, including a variety of aromatic chloroalkynes and bromoalkynes. (C) 2014 Elsevier Ltd. All rights reserved.
This paper describes a novel palladium-catalyzedoxidativecyclization of bromoalkynes with N-allylamines via cascade formation of C-N and C-C bonds. During this process, the bromine atom was retained to form 3-bromo-pyrroles, which can undergo the subsequent structural modifications.
A highly efficient and mild palladium‐catalyzed, one‐pot, four‐step cascadeannulation has been developed to afford functionalized β‐ and γ‐lactones in moderate to good yields with high regio‐ and diastereoselectivities in ionic liquids. The employment of ionic liquids under mild reactionconditions makes this transformation green and practical. Especially, this reaction provided a novel and convenient
A robust route to 4-amine-benzo[b][1,4]oxazepines relying upon a palladium-catalyzed tandemreaction of o-aminophenols, bromoalkynes and isocyanides has been developed. This chemistry presumably proceeds through the migratory insertion of isocyanides into the vinyl-palladium intermediate as a key step.
Palladium-Catalyzed Coupling of Alkynes with Unactivated Alkenes in Ionic Liquids: A Regio- and Stereoselective Synthesis of Functionalized 1,6-Dienes and Their Analogues
A palladium-catalyzed regio- and stereoselective intermolecular tandem reaction of alkynes and unactivated 1,6-ionic liquids is described, providing a practical, efficient, and versatile method for the synthesis of functionalized 1,6-dienes in moderate to good yields. The present reaction has high functional-group tolerance and gives products on a gram scale. Mechanistic studies indicate that the reaction might proceed via a chain-walking mechanism.