Gold-Catalyzed Reactions of 1,5- and 1,6-Enynes with Carbonyl Compounds: Cycloaddition vs. Metathesis
作者:Ana Escribano-Cuesta、Verónica López-Carrillo、Dominic Janssen、Antonio M. Echavarren
DOI:10.1002/chem.200900668
日期:2009.6.2
Gold and rings: The gold(I)‐catalyzed addition of aldehydes to 1,6‐enynes gives 1,3‐dienes, by a cycloaddition/fragmentation process. 1,5‐Enynes react with aldehydes and ketones by the 5‐endo‐dig pathway to give the corresponding cycloadducts.
One-Pot Three-Component Tandem Metathesis/Diels−Alder Reaction
作者:Hee-Yoon Lee、Hyoun Young Kim、Hyunsup Tae、Byung Gyu Kim、Jaeyoung Lee
DOI:10.1021/ol035194c
日期:2003.9.1
[reaction: see text] A tandem enyne, diene-ene metathesis reaction followed by Diels-Alderreaction accomplished a stereoselective three-componentreaction protocol with four stereocenters.
Gold(I) complexes are the most active catalysts for alkoxy- or hydroxycyclization and for skeletalrearrangement reactions of 1,6-enynes. Intramolecular alkoxycyclizations also proceed efficiently in the presence of gold(I) catalysts. The first examples of the skeletalrearrangement of enynes by the endocyclic cyclization pathway are also documented. Iron(III) is also able to catalyze exo and endo
Exchange of one PCy3 unit of the classical Grubbs catalyst 1 by N-heterocycliccarbene (NHC) ligands leads to "second-generation" metathesis catalysts of superior reactivity and increased stability. Several complexes of this type have been prepared and fully characterized, six of them by X-ray crystallography. These include the unique chelate complexes 13 and 14 in which the NHC- and the Ru-CR entities
Design of a Selective Ring-Closing Enyne Metathesis–Reduction for the Generation of Different Synthetic Scaffolds
作者:Denis N. Prada Gori、Caterina Permingeat Squizatto、Patricia G. Cornier、Carina M. L. Delpiccolo
DOI:10.1021/acs.joc.8b01511
日期:2018.10.19
A tandem process of ring-closing enyne metathesis (RCEYM)-reduction using modern ruthenium catalysts and a hydrogen donor is described. This straightforward methodology is useful for C(sp(3)) generation under mild reaction conditions. Variables such as solvent, catalyst, hydride source, and temperature were adjusted toward the exclusive formation of different products.