Viviana Heguaburu

• PhD
• Professor (Assistant) at Universidad de la República de Uruguay

Plutella xylostella (L.) is one of the main pests in Brassicaceae crops, although, information regarding its biology on alternative hosts is scarce, crucial for its mass rearing. We studied the development, biology, and population parameters of P. xylostella, fed with different Brassicaceae. In laboratory conditions, P. xylostella was reared from l...

Este documento sintetiza los avances realizados a la fecha por los tres subgrupos: biodiversidad, aire, suelo y agua, integrada por las instituciones mencionadas, donde a partir de la definición de un marco conceptual y abordaje metodológico acordados, se identificaron indicadores para medir, ya sea de forma directa como indirecta, los impactos amb...

The subfamily Cerambycinae, one of the most diverse in longhorn beetles, is well known for its remarkable chemical parsimony in male-emitted pheromones. Conserved shared structural motifs have been reported in numerous species, sometimes working in combination with plant volatile kairomones. Among other compounds, the most ubiquitous male pheromone...

The synthesis of jasmone and related jasmonoids and pyrethroids is described. These types of compounds play a defensive role in plants, and share a cyclopentenone common core, with variations in its side chains. Jasmone, cinerone, allylrethrone and derivatives are synthesized through π-allyl palladium cross coupling of stannane derivatives. By sele...

The stereoselective synthesis of several components of the aggregation pheromones of numerous longhorn beetle species is described. These attractants consist in 3-hydroxy-2-alkylketones and 2,3-alkyldiols with chain lengths varying from six to ten carbons. The 3R- and 3S-series are generated by organocatalytic α-hydroxylation of alkylketones with n...

The citrus borer, Diploschema rotundicolle, is a Neotropical longhorn beetle that has become a serious citrus pest in southern South America. Management strategies for this insect rely on trimming off damaged shoots, which is expensive and inefficient. We studied the chemical communication system in D. rotundicolle in search of attractants for moni...

Carpocapsa (Cydia pomonella) es la plaga de mayor importancia de manzano y peral en Uruguay. Por ello, en los últimos años se han hecho esfuerzos tendientes a su control por métodos alternativos al uso de insecticidas, como el método de confusión sexual, en el marco del Programa de Manejo Regional de Plagas en frutales de hoja caduca. Al disminuir...

The coupling of 2-(tributylstannyl)cyclopent-2-enone with several (π-allyl)palladium complexes derived from allylic electrophiles was investigated as the key step in the synthesis of jasmonoids. These compounds have an important role in plant development, triggering direct and indirect responses when harmed to induce pest resistance. Palladium-cata...

The synthesis of 3-hydroxy-2-hexanone and 2,3-hexanediol, two components of the aggregation pheromone of several cerambycid species, is disclosed in here. Starting from 2-hexanone, through an α-hydroxylation using (diacetoxyiodo)benzene, 3-hydroxy-2-hexanone is obtained in good yield. Further reduction of this compound, gives 2,3-hexanediol in exce...

The diamondback moth Plutella xylostella (L.) is known to cause economic damage to rapeseed, cabbage, and other cruciferous crops worldwide. Sex pheromone components of P. xylostella, including (Z)-11-hexadecenal, (Z)-11-hexadecenol, and (Z)-11-hexadecenyl acetate, were synthesized in a concise and divergent fashion in yields appropriate to develop...

Agrociencia Uruguay-Volumen 20 2:61-67-julio/diciembre 2016 The diamondback moth Plutella xylostella (L.) is known to cause economic damage to rapeseed, cabbage, and other cruciferous crops worldwide. Sex pheromone components of P. xylostella, including (Z)-11-hexadecenal, (Z)-11-hexadece-nol, and (Z)-11-hexadecenyl acetate, were synthesized in a c...

Natural products play an important role as a source not only of potential therapeutic drugs but also of starting materials for semisynthetic new medicines. The epoxyquinoid family, composed by cyclohexane epoxides and related structures, exhibit these characteristics without doubt. Since 2004, significant efforts have been devoted to the stereocont...

The dehydration of several sugars, including pentoses, hexoses, di, tri, and polysaccharides, in ionic liquids with acidic ion-exchange resins as heterogeneous catalysts was investigated. Good 2‐furaldehydes recovery yields, reaching 92% in some cases, were achieved when Dowex® 50W ion‐exchange resins and 1‐n‐butyl‐3‐methylimidazolium chloride ([C4...

A novel epoxyquinol analog was prepared by molecular simplification of monomeric and dimeric scaffolds. A feasible methodology for the insertion of side chains into cyclohexenone skeleton was developed. Insertion of the hydroxymethyl side chain was achieved through α-sulfonylcarbanion chemistry. The alkenyl chain was inserted through palladium cros...

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Stille reaction was performed with several halo cis-diol derivatives by reaction with allyltributyltin in the presence of a palladium catalyst forming allyl cis-dihydrodiol derivatives. These couplings were conducted with conventional heating as well as with microwave irradiation. Allylbenzene cis-dihydrodiol was obtained with excellent yield using...

The synthesis and potent antiprotozoal activity of 14-hydroxylunularin, a natural hydroxybibenzyl bryophyte constituent is reported. 14-hydroxylunularin was highly active in vitro assays against culture and intracellular forms of Leishmania spp. and Trypanosoma. cruzi, in absence of cytotoxicity against mammalian cells. Preliminary structure-activi...

A model compound for the central core of ambuic acid has been prepared chemoenzymatically from toluene in enantiomerically pure form. An approach to the introduction of the C-9 side chain has also been investigated.