Synthesis of 4,5-Dihydroisoxazoles by Condensation of Primary Nitro Compounds with Alkenes by Using a Copper/Base Catalytic System
作者:Luca Cecchi、Francesco De Sarlo、Fabrizio Machetti
DOI:10.1002/chem.200800554
日期:2008.9.8
A new procedure for the synthesis of 4.5-dihydroisoxazoles by condensation of primarynitrocompounds with olefins by using a copper/base catalytic system is described. The catalytic effect of copper(II) salts is evidenced by comparison of the reaction rates. Thus, activatednitrocompounds react faster than with organic catalysis by tertiary amines, whereas nitroalkanes, unable to condense with dipolarophiles
4,5-Dihydroisoxazoles by Copper(II)-Catalysed Condensation of Primary Nitroalkanes with Dipolarophiles
作者:Francesco De Sarlo、Fabrizio Machetti、Luca Cecchi
DOI:10.1055/s-2007-986629
日期:2007.9
Primary aliphatic nitro compounds condense with substituted alkenes to give 4,5-dihydroisoxazoles under copper(II) acetate catalysis in the presence of tertiary amines. Apparently nitrile oxides are not intermediates, as no furoxans are detected in these reactions.