(+/-)-5-(2,5-Dioxo-4-imidazolidinylmethyl)-3-(1-methyl-4-piperidyl)-1H-indole → (+/-)-3-[3-(1-Methyl-4-piperidyl)-1H-indol-5-yl]alanine

Beteiligte Stoffe

Reaktionsschritte

A solution of the product from step (d) (2.4 g) and barium hydroxide hydrate (8.4 g) in water (50 ml) was refluxed for 72 hours, then cooled and evaporated in vacuo. The residue was taken up in hot methanol and filtered to remove barium salts. The filtrate was evaporated in vacuo, the residue dissolved in water and dry ice added to precipitate barium carbonate. The latter was filtered off and the filtrate evaporated in vacuo to give the desired product as a yellow foam (1.3 g).

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