Nitroimidazoles are characterized by a wide range of biological activity and many them used as therapeutics. Moreover, some bicyclic nitroimidazooxazoles show considerable potency against Mycobacterium tuberculosis. Some authors noticed that in the case chiral derivatives nitroimidazodihydrooxazoles, (R) form shows greater tuberculostatic than (S) enantiomer. This work describes procurement new...

a method is described by which it is possible to determine the high barrier to ring inversion and hindered rotation by neat racemization of optically active compounds when the racemization is caused by ring inversion or hindered rotation. the method is based preparation of sufficiently pure enantiomers, mainly by chromatography on swollen microcrystalline triacetylcellulose (tac). by this techn...

an efficient one-pot three-component procedure for the synthesis of new chiral spiro-oxindolopyrrolizidines with highly regio-, diastereo-, and enantioselective from 1,3-dipolar cycloaddition of azomethine ylides and optically pure active cinamoyl oxazolidinone are described. the process occurs at room temperature in aqueous ethanol as green solvent and in the absence of any bidentate chelating...