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Aromatic amino acid ammonia-lyases catalyze the deamination of L-His, L-Phe, and L-Tyr, yielding ammonia plus aryl acids bearing an α,β-unsaturated propenoic acid. We report crystallographic analyses of unliganded Rhodobacter sphaeroides tyrosine ammonia-lyase (RsTAL) and RsTAL bound to p-coumarate and caffeate. His 89 of RsTAL forms a hydrogen bond with the p-hydroxyl moieties of coumarate and caffeate...
The first synthesis of tetra- and penta-substituted pyrroles via a 1,3-dipolar cycloaddition of alkynes to polymer bound munchnones is reported. These munchnones are generated in a single step from a four component condensation product of an aldehyde, an amine, a carboxylic acid and an isocyanide. The process produces pyrroles in good overall yield and high purity.
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