2,3-Dihydro-4<i>H</i>-pyran-4-ones and 2,3-Dihydro-4-pyridinones by Cyclizations of α,β-Unsaturated 1,3-Diketones
作者:Franklyn K. MacDonald、D. Jean Burnell
DOI:10.1021/jo901355e
日期:2009.9.18
β-unsaturated 1,3-diketonescyclize to 2,3-dihydro-4H-pyran-4-ones in an acidic aqueous medium, with exceptions being α,β-unsaturated 1,3-diketones in which the β carbon is substituted by a phenyl group. Addition of 1-butanamine to the reaction medium results in the formation of 2,3-dihydro-4-pyridinones, which appear to arise via an initial 1,4-addition of the amine to the α,β-unsaturated 1,3-diketones.
在酸性水性介质中,多种α,β-不饱和1,3-二酮环化为2,3-二氢-4 H -pyran-4-one,但α,β-不饱和1,3-二酮除外β碳被苯基取代。将1-丁胺添加到反应介质中会导致形成2,3-二氢-4-吡啶酮,这似乎是由于将胺最初添加到α,β-不饱和的1,3-中而发生的,即最初的1,4-添加。二酮。
Gold-Catalyzed Cycloisomerizations of Functionalyzed Cyclopropyl Alkynes: the Cases of Carboxamides and Alcohols
作者:Jesús M. Fernández-García、Hugo A. Garro、Laura Fernández-García、Patricia García-García、Manuel A. Fernández-Rodríguez、Isabel Merino、Enrique Aguilar
DOI:10.1002/adsc.201700264
日期:2017.9.4
alkynylcyclopropanecarboxamides through a nucleophilic addition/cyclopropane ring‐opening cascade process and, in this manuscript, the scope and the limitations of such reaction sequence are reported. The cascade reaction is general and occurs with complete regio‐ and quimioselection to form the seven‐membered heterocycles with the exception of primary alkyl‐substituted alkynylcyclopropanecarboxamides that