Derivatives of 3H-spiro1-benzofuran-2, 1’-cyclohexanes: immunostimulants for veterinary use / Derivados de 3H-espiro1-benzofurano-2, 1’-ciclohexanos: inmunoestimulantes de uso veterinario

Four 3H-spiro1-benzofuran-2, 1’-cyclohexanes were synthesized from filifolinol, two of which are reported for the first time. Docking molecular studies were carried out to determine in silico whether these derivatives have similar immunostimulant activity to that reported for filifolinol, and its oxidation product, filifolinone. Through of the study of interactions of these compounds with the heterodimer of the protein present in teleost TLR1-TLR2, filifolinol, 3’-filifolinchloride and filifolinyl acetate shows similar interactions between them, allowing to predict that they would have similar immunostimulant activity, but different to filifolinone and filifolinane or that they would act by a different mechanisms.

Cuatro 3H-spiro1-benzofuran-2, 1'-ciclohexanos se sintetizaron a partir de filifolinol, dos de los cuales son reportados por primera vez. Se llevaron a cabo estudios de docking molecular para determinar in silico si estos derivados tienen actividad inmunoestimulante similar a la reportada para filifolinol y su producto de oxidación, filifolinona. A través del estudio de las interacciones de estos compuestos con el heterodímero de la proteína presente en teleósteos TLR1-TLR2 se estableció que el filifolinol, 3'-cloruro de filifolinilo y acetato de filifolinilo tienen interacciones similares con el heterodímero, lo que permite predecir que entre ellos tendrían una actividad simi- lar, pero diferente a la de la filifolinona y filifolinano o que estos últimos actuarían por diferentes mecanismos.

Electrogeneration of hydrogen peroxide applied to the peroxide-mediated oxidation of (R)-limonene in organic media

Horse radish peroxidase (HRP) from Armoracia rusticana catalyses the oxidation of (R)-limonene into the oxidized derivatives carveol and carvone. This study compares the direct addition (DA) of hydrogen peroxide with its continuous electrogeneration (EG) during the enzymatic oxidation of (R)-limonene. Reaction mixtures containing HRP, (R)-limonene as substrate, and hydrogen peroxide, added directly or electrogenerated, in 100 mM sodium-potassium phosphate buffer pH 7.0, at 25ºC were studied. Two electrochemical systems for the hydrogen peroxide electrogeneration were evaluated, both containing as auxiliary electrode (AE) a platinum wire and saturated calomel electrode (SCE) as reference. Reticulated vitreous carbon foam (RVCF) and an electrolytic copper web (CW) were evaluated as working electrodes (WE). Results were compared in terms of hydrogen peroxide electrogeneration, (R)-limonene residual concentration or conversion and product selectivity. Best results in terms of maximum H2O2 concentration (1.2 mM) were obtained using the CW electrode at -620 mV SCE, and continuous aeration. Use of the EG system under optimized conditions, which included the use of acetone (30% v/v) as a cosolvent in a 3 hrs enzymatic reaction, lead to a 45% conversion of (R)-limonene into carveol and carvone (2:1). In comparison to the results obtained with DA, the use of EG also improved the half-life of the enzyme.