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Structure of 5-oxo-2-pyrrolidinylphosphonic acid

✍ Scribed by Sawka-Dobrowolska, W. ;Gruszecka-Kowalik, E.

Book ID
114505149
Publisher
International Union of Crystallography
Year
1987
Tongue
English
Weight
340 KB
Volume
43
Category
Article
ISSN
0108-2701

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## Abstract Enantiomerically pure 3‐ and 4‐substituted phosphonic acid derivatives 5 of pyroglutamic acid were prepared by a Michael addition of the lithiated (+)‐camphor derivative 2 to α,β‐unsaturated esters and subsequent hydrolysis. The reduction of the lactams 5 with LiBH~4~/BF~3~ · OEt~2~ aff

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The stereochemistry about the lactone ring system of the title compound, C 19 H 16 O 5 , has been established. Intermolecular hydrogen bonds are observed between carboxylic acid groups.