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Synthesis 1988; 1988(3): 218-219
DOI: 10.1055/s-1988-27516
DOI: 10.1055/s-1988-27516
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Aminosäuren, Teil 111. Eine einfache Synthese von N-Carboxy-α,β-didehydro-α-aminosäure-anhydriden (4-Alkyliden-2,5-oxazolidindionen)
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Publication Date:
20 August 2002 (online)
A Versatile Synthesis of N Carboxy-α,β-didehydro-α-amino Acid Anhydrides (4-Alkylidene-2,5-oxazolidinediones) α-Azidocarboxylic acids 1 react with phosgene in the presence of catalytic amounts of sodium perrhenate in dimethoxyethane at 85°C to give N-carboxy-α,β-didehydroamino acid anhydrides (4-alkylidene-2.5-oxazolidinediones) 2 in good yields.