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Preparation and phytotoxicity of sorgoleone analogues

Barbosa,Luiz Cláudio de Almeida; Ferreira,Maria Lúcia; Demuner,Antonio Jacinto; Silva,Antonio Alberto da; Pereira,Rita de Cássia

3,5-Dimethoxybenzylic alcohol was converted into the 2-acetoxy-5-methoxy-3-(pent-1-yl)-1,4-benzoquinone (12), in seven steps, with an overall yield of 14.6%. The natural quinone sorgoleone (1) was isolated from Sorghum bicolor and converted into the corresponding quinone (13) having a saturated side chain. The selective effects of these compounds (1, 12 and 13), at the dose of 5.6 mug of a.i./ g of substrate, o...

Date: 2001   |   Origin: Oasisbr
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The Diels-Alder reaction: an update

Brocksom,Timothy John; Nakamura,Joanita; Ferreira,Maria Lúcia; Brocksom,Ursula

The last ten years have seen an explosive growth in synthetic applications of the Diels-Alder reaction, principally the intramolecular (IMDA) reaction but also the transannular (TADA) version. In this review we present these developments with special emphasis on the synthetic concepts and the experimental results and include related theoretical studies.

Date: 2001   |   Origin: Oasisbr
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