Gregorio Torres’s research while affiliated with University of Malaga and other places

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

The one-pot three-component reaction of an aryl aldehyde, an arylamine, and a trialkylborane in the presence of hydrogen peroxide afforded the alkylated arylamines 1 in good yields via oxidized imine–borane complexes. In addition, the versatility of our procedure has been confirmed by the use of enolizable aldehydes, alkylic amines, and cyclic imines.

The total synthesis of the natural compound (8S*,14S*)-8-(4′-hydroxybenzyl)-2,3-dimethoxyberbin-10-ol and its C-8 epimer has been conveniently developed by making use of the diastereoselective Stevens rearrangement of the corresponding N-(arylmethyl)berbinium salts as the key step.

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

The reaction of an aldimine with dicyclohexylboron chloride in the presence of hydrogen peroxide gives N-[cyclohexyl(aryl)methyl]arylamines 2 in good yields via oxidized imine–borane complexes. The amines can also be obtained by a three-component reaction involving an arenecarbaldehyde, an arylamine and a dialkylchloroborane reagent. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)

An improved synthetic approach to protopines based on the sequential Hofmann elimination, hydroboration and oxidation of N-(arylmethyl)berbinium salts has been designed. By using berberine chloride as the starting material, this sequence of reactions has provided two new nonnatural protopines, N-benzyl-N-nordihydroallocriptopine and N-(p-methoxybenzyl)-N-nordihydroallocriptopine and the natural allocriptopine. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)

Six cularine alkaloids, cularicine, O-methylcularicine, celtisine, cularidine, cularine and celtine, three isocularine alkaloids, sarcophylline, sarcocapnine and sarcocapnidine, and five non-cularine alkaloids, glaucine, protopine, ribasine, dihydrosanguinarine and chelidonine, were identified and quantified by GC-MS in nine taxa of the genus Sarcocapnos (Fumariaceae). The chemotaxonomic significance of the results is discussed. Copyright © 2005 John Wiley & Sons, Ltd.

Six cularine alkaloids, cularicine, O-methylcularicine, celtisine, cularidine, cularine and celtine, three isocularine alkaloids, sarcophylline, sarcocapnine and sarcocapnidine, and five non-cularine alkaloids, glaucine, protopine, ribasine, dihydrosanguinarine and chelidonine, were identified and quantified by GC-MS in nine taxa of the genus Sarcocapnos (Fumariaceae). The chemotaxonomic significance of the results is discussed.