The title compounds Li2+[R2CH![[double bond, length half m-dash]](https://www.rsc.org/images/entities/char_e006.gif)
CC(–Ō)NR1], prepared from secondary α-keto-amides via the Shapiro reaction, reacted at C-2 with aldehydes, acetone, and deuterium oxide; the products [R2CHC(CONHR1)C(OH)R4R5] were intermediates for the synthesis of substituted 3-methylenetetrahydrofuran-2-ones.
R. M. Adlington and A. G. M. Barrett, J. Chem. Soc., Chem. Commun., 1981, 65 DOI: 10.1039/C39810000065
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