Cu(I) Catalyst in DMF: An Efficient Catalytic System for the Synthesis of Furans from 2-(1-Alkynyl)-2-alken-1-ones
作者:Nitin T. Patil、Huanyou Wu、Yoshinori Yamamoto
DOI:10.1021/jo050191u
日期:2005.5.1
The cyclization of 2-(1-alkynyl)-2-alken-1-ones 1 proceeded very smoothly in the presence of alcohols 2 with a catalytic amount of Cu(I)Br in DMF at 80 °C, leading to the formation of highlysubstitutedfurans 3. The catalytic system reported herein is easy to handle, compared to the previously known system wherein the reaction between 1 and 2 needed to use moisture sensitive gold(III) chloride.
Tethering a metal complex to its phosphate counterion via a phosphine ligand enables a new strategy in Asymmetric Counteranion-Directed Catalysis (ACDC). A straightforward, scalable synthetic route gives access to the gold(I) complex of a chiral phosphine displaying a phos-phoric acid function. The complex generates a catalytically active species with an unprecedented intramolecular relationship between
Pd-mediated synthesis of substituted benzenes fused with carbocycle/heterocycle
作者:Nalivela Kumara Swamy、Lakshmi Kumar Tatini、J. Moses Babu、Pazhanimuthu Annamalai、Manojit Pal
DOI:10.1039/b612770c
日期:——
A new Pd-catalyzed one-pot multicomponent coupling reaction for the construction of benzene ring fused with carbocycle or heterocycle under a Cu-free condition is described.
报道了一种新型的无铜条件下,钯催化的一锅多组分耦合反应,用于构建苯环与碳环或杂环的并环结构。
α-Arylation and Alkynylation of Cyclic α-Iodoenones Using Palladium-Catalyzed Cross-Coupling Reactions with Trifluoroborate Salts
An expeditious synthesis of α-aryl- and α-alkynylcyclohexenones is described and illustrated by palladium-catalyzed cross-coupling reaction of cyclic α-iodoenones with potassium aryl-trifluoroborate salts. This procedure offers easy access to α-arylated and alkynylated cyclohexenones functionalized with electrondonor and -acceptor substituents in good yields.
Stereoselective synthesis of bicyclo[3.n.1]alkenone frameworks by Lewis acid-catalysis
作者:Stalin R. Pathipati、Lars Eriksson、Nicklas Selander
DOI:10.1039/c7cc06400d
日期:——
An intermolecular cyclization of alkynyl enones with cyclic ketones for the synthesis of bicyclo[3.n.1]alkenones is reported. This protocol exhibits a high functional group tolerance and provides access to a variety of bicyclic systems found as skeletons in many natural products.