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Pyridone and or pyrimidinediones formation from a cycloaddition NHC-Ni catalysed

Pyridone carboxylic acids 64 can be selectively decarboxylated to the saturated derivatives 65 via a reagent-free microwave-assisted method. Decarboxylation was also conducted under conventional heating but then copper cyanide was required resulting in mixtures of saturated and unsaturated 2-pyridones

Pyridone is considerably more polar than its hydroxypyridinc tautomer, and its extended n system also renders it highly polarizable. As a resiill, polar solvents shift the equilibrium between the two strongly to the right in comparison to the gas phase

Pyridone ring reduction .

Pyridone synthesis from the reaction of acylketenes and imines

Pyridone synthesis using a ring-closing metathesis oxidation strategy.

Pyridone synthesis.86

Pyridostigmine bromide and AChE.

Pyridotriazine salts studied by X-ray crystallography.

Pyridotriazines studied by X-ray crystallography.

Pyridotriazines with biological activity.

Pyridoxal 5 -phosphate , a special coenzyme for reactions of amino acids.

Pyridoxal 5 -phosphate and pyridoxamine 5 phosphate.

Pyridoxal 5-phosphate

Pyridoxal cofactor

Pyridoxal phosphate amino acid as a Schiff base. indicates a phosphate group. Bonds around the a-carbon can react as follows

Pyridoxal phosphate at the active site of aspartate aminotransferase.

Pyridoxal Phosphate Dependent Decarboxylase Mechanism

Pyridoxal phosphate-isoniazid interaction.

Pyridoxal phosphate. The structure of a cofactor.

Pyridoxal-5 -phosphate biosynthesis. In the upper part of the figure the DXP route is depicted as realized, for example, in coli. The lower part shows the R5P route of, for example, in B. subtilis.

Pyridoxal-dependent oi, i-climinatkm or P-chloroalanine.

Pyridoxal-derived isoquinolines.

Pyridoxamine phosphate is the coenzyme for the enzymatic conversion of a-keto acids to amino acids while itself being converted to pyridoxal phosphate.

Pyridoxamine was attached to a cyclodextrin on compound 25 and to a synthetic macrocycle in 26 that also binds substrates and promotes their transaminations.

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