1,2-amino alcohols and their heterocyclic derivatives as chiral auxiliaries in asymmetric synthesis

Article Abstract:

The 1,2-amino alcohols are useful chiral auxiliaries essential in asymmetric synthesis of oxazolidines, oxazinones, proline derivatives, and oxazolidinones. Acyclic 1,2-amino alcohol derivatives are prepared using amino acids, epoxides, alpha-amino carbonyl compounds, alkoxy carbonyl compounds or cyclic sulfates. These cyclic amino alcohols participate in a series of aldol, alkylation, substitution, cycloaddition, and conjugate reactions. The experimental procedure for synthesizing oxazolidines, oxazinones, and proline derivatives is discussed.

Chemical reactions, Ligands, Ligands (Chemistry), Amino compounds, Alcohols

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Dissimilatory nitrite and nitric oxide reductases

Article Abstract:

The dissimilatory nitrite and nitric oxide reductases use a denitrifying mechanism for their action. Nitrite reductases either contain heme cd(sub 1) chromophores or copper. These reductases initially protonate the oxygen and eliminate one oxygen atom by dehydrogenation. The nitric oxide reductases are of two types. One type that is membrane-bound and is found in denitrifying bacteria, and the other is a soluble enzyme that reduces NO in some particular fungi.

Enzymes, Oxidation-reduction reaction, Oxidation-reduction reactions, Denitrification

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