First dynamic kinetic resolution of selenium-containing chiral amines catalyzed by palladium (Pd/BaSO4) and Candida antartica lipase (CAL-B)
作者:Leandro H. Andrade、Alexandre V. Silva、Eliane C. Pedrozo
DOI:10.1016/j.tetlet.2009.05.022
日期:2009.7
chemoenzymatic dynamickineticresolution of selenium-containing chiral amines (organoselenium-1-phenylethanamines) has been developed, leading to the corresponding amides in excellent enantioselectivities and high isolated yields. This one-pot procedure employs two different types of catalysts: Pd on barium sulphate (Pd/BaSO4) as racemization catalyst and lipase (CAL-B) as the resolution catalyst.
已开发出一种有效的化学方法,用于动态化学拆分含硒的手性胺(有机硒-1-苯基乙胺),从而以优异的对映选择性和高分离产率得到相应的酰胺。这种一锅法使用两种不同类型的催化剂:硫酸钡上的钯(Pd / BaSO 4)作为外消旋催化剂,脂肪酶(CAL-B)作为拆分催化剂。
ω-Transaminases as efficient biocatalysts to obtain novel chiral selenium-amine ligands for Pd-catalysis
作者:Leandro H. Andrade、Alexandre V. Silva、Priscila Milani、Dominik Koszelewski、Wolfgang Kroutil
DOI:10.1039/b920946h
日期:——
ω-Transaminases have been evaluated as biocatalysts in the reductive amination of organoselenium acetophenones to the corresponding amines, and in the kinetic resolution of racemic organoselenium amines. Kinetic resolution proved to be more efficient than the asymmetric reductive amination. By using these methodologies we were able to obtain both amine enantiomers in high enantiomeric excess (up to
Straightforward microwave-assisted synthesis of organochalcogen amines by reductive amination
作者:Mara C. Dalmolin、Pamela T. Bandeira、Matheus S. Ferri、Alfredo R.M. de Oliveira、Leandro Piovan
DOI:10.1016/j.jorganchem.2018.08.007
日期:2018.11
these methods produce organochalcogen amines in poor yields, by long reactions that require protectivegroups. In this regard, a set of aryl chalcogen (Se, Te) amines were prepared by reductive amination employing a microwave-assisted one-pot protocol. This approach offered a convenient and versatile method to synthesize primary and secondary organochalcogen amines with significantly short time reactions
Synthesis, Antioxidant Activity and Cytotoxicity of N-Functionalized Organotellurides
作者:Pamela T. Bandeira、Mara C. Dalmolin、Mariana M. de Oliveira、Karine C. Nunes、Francielle P. Garcia、Celso V. Nakamura、Alfredo R.M. de Oliveira、Leandro Piovan
DOI:10.1016/j.bmc.2018.12.017
日期:2019.1
protect the organism against cellular damage caused by oxidative stress. In this context, organotellurides have been described as promising antioxidant agents for decades. Herein, a series of N-functionalized organotellurium compounds has been tested as antioxidant and presented remarkable activities by three different in vitro chemical assays. They were able to reduce DPPH radical with IC50 values