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- W2058516880 abstract "A process for preparing optically active 2,5-morpholinediones 1 is described starting from optically active α-amino acids and optically active α-hydroxy esters. The process involves three steps: In the first step the sodium salt of an α-amino acid is condensed with an α-hydroxy ester to yield an optically active N-(α-hydroxy acyl)-α-amino acid 4. In the second step the hydroxy acid obtained is subjected to esterification with ethanol. In the third step the N-(α-hydroxy acyl)-α-amino acid ethyl ester 5 is subjected to cyclization with an acidic catalyst. For some examples the cyclization was also performed directly from the hydroxy acid 4. Morpholinediones 1 are useful as precursors for the preparation of poly(depsipeptides) 2 and copolymers containing depsipeptide repeating units." @default.
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- W2058516880 date "1998-05-01" @default.
- W2058516880 modified "2023-10-17" @default.
- W2058516880 title "Aminolysis ofα-hydroxy acid esters withα-amino acid salts; first step in the synthesis of optically active 2,5-morpholinediones" @default.
- W2058516880 doi "https://doi.org/10.1002/(sici)1521-3935(19980501)199:5<825::aid-macp825>3.0.co;2-w" @default.
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