Gold-Catalyzed [4+2]- and [3+3]-Annulations of Ynamides with 1-Yn-3-ols to Access Six-Membered Carbocycles and Oxacycles <i>via</i>
Three Distinct Cyclizations
作者:Sovan Sundar Giri、Rai-Shung Liu
DOI:10.1002/adsc.201700784
日期:2017.10.4
and 1‐yn‐3‐ols are described; the resulting carbo‐ and heterocycles were produced efficiently in one‐pot operations using a gold catalyst. The chemoselectivities of these annulations are controlled by variations of the substituents of the ynamides and the 1‐yn‐3‐ols. This reaction sequence involves initial alkoxylations of ynamides, followed by Claisen rearrangement of propargylic enolethers, and ends
Sonogashira cross-coupling reaction of organotellurium dichlorides with terminal alkynes
作者:Antonio L Braga、Diogo S Lüdtke、Fabrı́cio Vargas、Ricardo K Donato、Claudio C Silveira、Hélio A Stefani、Gilson Zeni
DOI:10.1016/s0040-4039(03)00098-4
日期:2003.2
The Sonogashira cross-coupling reaction of vinylic and heteroaromatic tellurium dichlorides has been explored, yielding the corresponding enynes and 2-alkynyl substituted heteroaromatic compounds. The reaction was carried out with PdCl2/CuI as catalysts and triethylamine as base, using methanol as solvent. The reaction proceeded under mild conditions and the cross-coupled products were obtained in good yields and in a stereoconservative manner. (C) 2003 Elsevier Science Ltd. All rights reserved.