Sulfides, sulfones, and sulfoxides of the furan-2(5H)-one series. synthesis and structure

A number of 4- and 5-R-sulfanylfuran-2(5H)-one derivatives were synthesized, and their oxidation with various reagents was studied. The corresponding sulfones were obtained using hydrogen peroxide in acetic acid. 4-R-sulfanyl derivatives were selectively oxidized to sulfoxides with m-chloroperoxybenzoic acid. The molecular and crystal structures of some new sulfones and sulfoxides were determined by X-ray analysis. © 2014 Pleiades Publishing, Ltd

МУЛЬТИЛОКУСНОЕ СИКВЕНСТИПИРОВАНИЕ ШТАММОВ STREPTOCOCCUS PNEUMONIAE, ВЫДЕЛЕННЫХ У ПАЦИЕНТОВ ПОЖИЛОГО ВОЗРАСТА С ВНЕБОЛЬНИЧНЫМИ ПНЕВМОНИЯМИ

Comuunity-acquired pneumonias in aged patients is the significant epidemiology problem for the public health of almost all the countries. Even more important the problem of microbiological monitoring and epidemiology surveillance for the S. pneumoniae strains as one of the ubiquitous pathogens causing as the community-acquired pneumonias as well the other infections of respiratory tract, what defines their different epidemiological meaning.Multilocus sequence typing is the perspective method of molecular epidemiological surveillance allowing to define the epidemiologically dangerous clones of the ubiquitous microorganisms as Streptococcus pneumomiae. The aim of our research was to conduct the multilocus sequence typing of pneumococci strains isolated in patients with community acquired pneumonias, bronchitis in aged patients.Materials and methods. There were taken 14 strains of S. pneumoniae, isolated in patients with community-acquired pneumonias (seven of them were multiresistant), eight strains were isolated from patients with the chronical onstructive lung diseases and four strains from carriers. Multilocus sequence typing was conduected according to method to M.C. Enright and B.G. Spratt (1998).Results. The strains, isolated in all populations were the related isolates of the species S. pneumoniae, the most of them had the unique genotype defining the sequence type for every strain. There were 6 strains of Taiwan 19F-14 genotype from 14 strains isolated in aged patients with community-acquired pneumonia. Among strains isolated from carriers there were prevailing the strai of R6 genotype.Conclusion. Multilocus sequence typing allows to identify the new genotypes and to prognose the appearing of epidemiologically dangerous strains with new peculiarities.Внебольничные пневмонии у лиц пожилого возраста являются значимой эпидемиологической проблемой для здравоохранения практически всех стран. Особенно актуальна проблема микробиологического мониторинга и эпидемиологического надзора за штаммами Streptococcuspneumoniae, как одного из убиквитарных возбудителей, вызывающих внебольничные пневмонии и другие инфекции дыхательных путей различной степени тяжести, что определяется их различной эпидемической значимостью.Мультилокусное сиквенстипирование – перспективный метод молекулярно-эпидемиологического мониторинга, позволяющего идентифицировать эпидемически опасные клоны S. pneumoniae. Целью исследования являлось проведение мультилокусного сиквенстипирования штаммов пневмококка, выделенных у пациентов с внебольничными пневмониями, бронхитами и у носителей пожилого возраста.Материал и методы. Было проведено исследование 14 штаммов, выделенных у пациентов с внебольничными пневмониями (из них 7 полирезистентных), 8 штаммов от пациентов с хронической обструктивной болезнью легких, 4 штамма от носителей. Мультилокусное сиквенстипирование было проведено согласно методике M.C. Enright и B.G. Spratt (1998).Результаты. Все штаммы, выделенные в трех популяциях, представляют собой родственные изоляты вида S. pneumoniae, большинство из которых (18 из 26) обладают уникальным генотипом, определяющим наличие одного сиквенстипа для каждого штамма. Из 14 штаммов, выделенных у лиц пожилого возраста с внебольничной пневмонией, 6 относились к профилю Taiwan19F-14. Среди штаммов, выделенных от носителей, превалировал штамм, идентичный штамму R6. Среди штаммов, выделенных от пациентов с хронической обструктивной болезнью, превалирования какого-либо генотипа не выявлено.Заключение. Мультилокусное сиквенстипирование позволяет идентифицировать новые генотипы и дать прогноз относительно появления эпидемически опасных штаммов с новыми свойствами

Sulfides, sulfones, and sulfoxides of the furan-2(5H)-one series. synthesis and structure

A number of 4- and 5-R-sulfanylfuran-2(5H)-one derivatives were synthesized, and their oxidation with various reagents was studied. The corresponding sulfones were obtained using hydrogen peroxide in acetic acid. 4-R-sulfanyl derivatives were selectively oxidized to sulfoxides with m-chloroperoxybenzoic acid. The molecular and crystal structures of some new sulfones and sulfoxides were determined by X-ray analysis. © 2014 Pleiades Publishing, Ltd

Sulfides, sulfones, and sulfoxides of the furan-2(5H)-one series. synthesis and structure

A number of 4- and 5-R-sulfanylfuran-2(5H)-one derivatives were synthesized, and their oxidation with various reagents was studied. The corresponding sulfones were obtained using hydrogen peroxide in acetic acid. 4-R-sulfanyl derivatives were selectively oxidized to sulfoxides with m-chloroperoxybenzoic acid. The molecular and crystal structures of some new sulfones and sulfoxides were determined by X-ray analysis. © 2014 Pleiades Publishing, Ltd

Sulfides, sulfones, and sulfoxides of the furan-2(5H)-one series. synthesis and structure

A number of 4- and 5-R-sulfanylfuran-2(5H)-one derivatives were synthesized, and their oxidation with various reagents was studied. The corresponding sulfones were obtained using hydrogen peroxide in acetic acid. 4-R-sulfanyl derivatives were selectively oxidized to sulfoxides with m-chloroperoxybenzoic acid. The molecular and crystal structures of some new sulfones and sulfoxides were determined by X-ray analysis. © 2014 Pleiades Publishing, Ltd

Facile Access to Optically Active 2,6-Dialkyl-1,5-Diazacyclooctanes

© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim The chiral substituted 1,5-diazacyclooctane (1,5-DACO) is of considerable importance and has attracted attention from a wide range of fields due to their unique chemical and biological properties. Despite the application potential, further study has not been optimized due to difficulties in their synthetic accessibility. Here, we report that the 1,5-DACO bearing a chiral auxiliary obtained from the formal [4+4] cycloaddition of N-alkyl-α,β-unsaturated imines can be further derivatized by nucleophilic alkylation to give various chiral substituted 1,5-DACO derivatives. The removal of the chiral auxiliary was effectively carried out using hydrogenation over Pearlman's catalyst. This methodology allows the production of a broad range of unprecedented optically active 2,6-dialkyl-1,5-DACO, which could not be accessed by other methods

Facile Access to Optically Active 2,6-Dialkyl-1,5-Diazacyclooctanes

© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim The chiral substituted 1,5-diazacyclooctane (1,5-DACO) is of considerable importance and has attracted attention from a wide range of fields due to their unique chemical and biological properties. Despite the application potential, further study has not been optimized due to difficulties in their synthetic accessibility. Here, we report that the 1,5-DACO bearing a chiral auxiliary obtained from the formal [4+4] cycloaddition of N-alkyl-α,β-unsaturated imines can be further derivatized by nucleophilic alkylation to give various chiral substituted 1,5-DACO derivatives. The removal of the chiral auxiliary was effectively carried out using hydrogenation over Pearlman's catalyst. This methodology allows the production of a broad range of unprecedented optically active 2,6-dialkyl-1,5-DACO, which could not be accessed by other methods