Carlos González-Romero

Azide-enolate 1,3-dipolar cycloaddition in the synthesis of novel triazole-based miconazole analogues as promising antifungal agents.

Seven miconazole analogs involving 1,4,5-tri and 1,5-disubstituted triazole moieties were synthesized by azide-enolate 1,3-dipolar cycloaddition. The antifungal activity of these compounds was evaluated in vitro against four filamentous fungi, including Aspergillus fumigatus, Trichosporon cutaneum, Rhizopus oryzae, and Mucor hiemalis as well as three species of Candida spp. as yeast specimens. These pre-clinical studies suggest that compounds 4b, 4d and 7b can be considered as drug candidates for future complementary biological studies due to their good/excellent antifungal activities.

A facile synthesis of novel miconazole analogues and the evaluation of their antifungal activity

Four novel miconazole analogues (8-11) were synthetized and evaluated for activity against four filamentous fungi (Mucor hiemalis, Aspergillus fumigatus, Trichosporon cutaneum, and Rhizopus oryzae) and eight species of Candida as yeast specimens. Compounds 9 and 10 showed very good activity when evaluated in yeast (MIC 0.112 and 0.163xa0μg/mL) compared to the reference compound, itraconazole (MIC 0.067xa0μg/mL). The best antifungal activity in filamentous strains was shown by compound 9. Hence compounds 9 and 10 represent new leads for further pharmacomodulation in this series.

Aluminium Chloride Hexahydrate (AlCl3 · 6H2O): An Efficient, Facile, Mild, And Highly Chemoselective Catalytic Deprotection of Tert-Butyldimethylsilyl (TBS) Ethers

Abstract tert-Butyldimethylsilyl (TBS) phenyl / alkyl ethers were cleaved to the corresponding efficiently parent hydroxyl compounds in good yields using catalytic amounts of AlCl3 · 6H2O by conventional or microwave-assisted heating in methanol or isopropanol solution. Intramolecular and competitive experiments demonstrated the chemoselective deprotection of TBS ethers in the presence of triisopropylsilyl and tert-butyldiphenylsilyl ethers. GRAPHICAL ABSTRACT

Synthesis of caffeine from theobromine: Bringing back an old experiment in a new setting

Caffeine is one of the most widely consumed, naturally occurring, mild, and central nervous system stimulants. Its synthesis, by the N-methylation (SN2 substitution) of theobromine is described as an experiment for the undergraduate organic chemistry laboratory. The N-methylation of theobromine is rapid and efficient and its progress is monitored by TLC using authentic standards. The undergraduate student also is able to observe the effect of temperature on the rate of the N-methylation reaction.

A straightforward and versatile protocol for the direct conversion of benzylic azides to ketones and aldehydes

The synthesis of carbonyl compounds from benzylic azides through benzylideneamides is described for the first time. NaH-mediated activation of benzyl azides allows a rapid water-promoted oxidation under a facile protocol with good yields.

Antifungal activity of 1'-homo-N-1,2,3-triazol-bicyclic carbonucleosides: A novel type of compound afforded by azide-enolate (3+2) cycloaddition.

The first report of 1-homo-N-1,2,3-triazol-bicyclic carbonucleosides (7a and 7b) is described herein. Azide-enolate (3+2) cycloaddition afforded the synthesis of this novel type of compound. Antifungal activity was evaluated in vitro against four filamentous fungi (Aspergillus fumigatus, Trichosporon cutaneum, Rhizopus oryzae and Mucor hiemalis) as well as nine species of Candida spp. as yeast specimens. These pre-clinical studies suggest that compounds 7a and 7b are promising candidates for complementary biological studies due to their good activity against Candida spp.