Ketones bromine

Introduction of branching in the side chain is apparently consistent with retention of the antiparkinson activity. Bro-mination of propiophenone gives the brominated ketone, 33. Dis-... 

A rather more complex tertracyclic indole based compound lowers blood pressure by selective blockade of a 1-adrenergic receptors. Reaction of the anion from indole (72-1) with butyrolactone (72-2) leads to the scission of the carbon-oxygen bond in the reagent and the formation of the alkylated product (72-3). The acid is then cyclized onto the adjacent 2 position to give the ketone (72-4) by treatment with a Lewis acid such as polyphosphoric acid. Reaction with bromine then leads to the brominated ketone (72-5). This is subjected to reductive alkylation with ethylene... 

If the enolization has enough time to proceed, the transformation in Figure 12.4 completely leads to a brominated /J-ketoester. Basically, the same method can be employed to also a-brominate ketones (Figure 12.5), alkylated malonic acids (Figure 12.6), acid bromides (Figure 12.7,12.8) and acid chlorides (not shown). The mechanistic details are detailed in the cited figures. Look at how similar they are. 

Type of reaction C-halogen bond formation Reaction condition solvent-free Keywords NBS, bromination, ketone... 

AMYL ALDEHYDE (110-62-3) CsH,oO Highly flammable liquid. Peroxidizable material. Forms explosive mixture with air (flash point 54°F/12°C Fire Rating 3). Violent reaction with strong oxidizers, bromine, ketones. Incompatible with strong acids (may cause exothermic selfcondensation or polymerization reactions) ammonia, strong caustics, amines, amides, organic hydroxides. Unless stabilized, with antioxidants (to retard autoxidation), this... 

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