Metal-free visible light-promoted synthesis of isothiazoles: a catalytic approach for N–S bond formation from iminyl radicals under batch and flow conditions
applying photoredoxcatalysis. This simple strategy features mild conditions, broad scope and wide functional group tolerance representing a new enviromentally friendly option to prepare these highly valuable heterocycles. Furthermore, the synthetic value of the method is highlighted by the preparation of a natural product derivative and the implementation of the reaction in a continuousflow setup.
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
Reaction of 2-acylphenylselenocyanates with hydroxylamine and phenylhydrazine
作者:D.E. Ames、A.G. Singh、W. Franklyn Smyth
DOI:10.1016/s0040-4020(01)91862-9
日期:1983.1
2-Selenocyanatobenzophenone reacts with hydroxylamine to give 3 - phenyl - 1,2 - benzisoselenazole N-oxide, the structure of which is indicated by polarographic reduction studies. The corresponding methyl and ethylketones react similarly but 3 - methyl - 2 - selenocyanato acetophenone yields 4,8 - dimethyl - 2 - imino - 2H -1, 3 - benzoselenazine 3-oxide. Benzoselenopheno[3,2-b]indole is formed under
First chemoenzymatic synthesis of organoselenium amines and amides
作者:Leandro H. Andrade、Alexandre V. Silva
DOI:10.1016/j.tetasy.2008.04.026
日期:2008.5
A series of organoselenium amines have been synthesized and submitted to the enzymatic kinetic resolution by acetylation mediated by CAL-B (Novozym 435) to give the corresponding chiral amides in an enantiomerically pure form. After evaluating the appropriate lipase, solvent, temperature,and lipase/substrate ratio in the kinetic resolution, the chiral organoselenium amides were obtained with enantiomeric excess of up to 99%. (C) 2008 Elsevier Ltd. All rights reserved.
AMES, D. E.;SINGH, A. G.;SMYTH, W. F., TETRAHEDRON., 1983, 39, N 5, 831-833