C. Perollier et al., A CONVENIENT ACCESS TO N,N-DISUBSTITUTED AMIDES DERIVED FROM 3S)-2,2-DIMETHYL-3-FORMYLCYCLOPROPANE-1-CARBOXYLIC ACID, Bulletin de la Societe chimique de France, 134(5), 1997, pp. 517-523
Enantiopure N,N-disubstituted amides are obtained in good yield from (
-)-2,2-dimethyl-3-formylcyclopropane-1-carboxylic acid in three steps:
dithiane protection of the aldehyde function; amidation of the carbox
ylic acid function; dethioketalization. Mono-N-substituted amides rear
range to a bicyclic lactam form. The X-ray structure of a dithiane-pro
tected mono-N-substituted amide intermediate is reported.