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.