Process for the preparation of pure cis-cyclopropane carboxylic acids and intermediates therefor
申请人:IMPERIAL CHEMICAL INDUSTRIES PLC
公开号:EP0339815A3
公开(公告)日:1991-07-10
A process for the preparation of cis-cyclopropane carboxylic acids which comprises the step of treating a derivative of a 4-hydroxy-2,2-dimethyl bicyclo[3,1,0]hexan-2-one with a source of hydroxide ions.
Access to Dienophilic Ene-Triketone Synthons by Oxidation of Diketones with an Oxoammonium Salt
作者:Nicholas A. Eddy、Christopher B. Kelly、Michael A. Mercadante、Nicholas E. Leadbeater、Gabriel Fenteany
DOI:10.1021/ol2030873
日期:2012.1.20
Here we describe the oxidation of 1,3-cyclohexanediones with 4-acetamido-2,2,6,6-tetramethylpiperidine-1-oxoammonium tetrafluoroborate (Bobbitt's salt) to generate 5-ene-1,2,4-triones in moderate-to-good (40-80%) yields. This inexpensive oxidant facilitated an unprecedented cascade of oxidation and elimination to yield novel ene-triketones. The reactivity of these products was explored in the Diets-Alder reaction and provided moderate-to-good yields of cycloaddition products. The products described in this study represent unique, densely functionalized, and versatile building blocks for the synthesis of more complex molecules.
Isomerisation of 2,2-dimethyl dimedone to (d,l) cis-chrysanthemic acid
(D,L) cis-Chrysanthemic acid has been obtained in four steps from 2,2-dimethyl dimedone which involves Bamford-Stevens olefination and tandem cyclization-Grob fragmentation reactions. (C) 2000 Published by Elsevier Science Ltd. All rights reserved.
The Effect of Lewis Acids on the Cycloaddition of 3,3,6-Trimethylcyclohex-5-ene-1,2,4-trione: Hydrogen Transfer versus Cycloaddition with Cyclopentadiene
作者:Nicholas A. Eddy、Jay J. Richardson、Gabriel Fenteany
DOI:10.1002/ejoc.201300706
日期:2013.8
Exposure of 3,3,6-trimethylcyclohex-5-ene-1,2,4-trione to catalytic amounts of Lewisacids revealed two disparate reactions in the presence of cyclopentadiene. The expected cycloaddition was found to be reversible for the title compound, and transferhydrogenation was the preferred pathway over long periods of time. Other tested substrates were able to undergo facile cycloaddition with considerable