Science and Technology Production
Article
Authorship
Date
2022
Publishing House and Editing Place
WILEY-V C H VERLAG GMBH
Magazine
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY,
vol. 2022
(pp. 1-8)
WILEY-V C H VERLAG GMBH
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1,3-Dipolar cycloadditions were conducted starting from azomethine ylides and enantiomerically pure sugar-derived dihydropyranones. The ylide intermediates were generated from imines obtained by condensation of glycine or L-alanine esters and 2,2-dimethoxyacetaldehyde. This aldehyde was employed as precursor of a dimethoxymethyl group attached to the pyrrolidine ring, instead of the usual aryl group derived from aromatic aldehydes. Under silver catalysis the cycloaddition was highly regio- and ...
1,3-Dipolar cycloadditions were conducted starting from azomethine ylides and enantiomerically pure sugar-derived dihydropyranones. The ylide intermediates were generated from imines obtained by condensation of glycine or L-alanine esters and 2,2-dimethoxyacetaldehyde. This aldehyde was employed as precursor of a dimethoxymethyl group attached to the pyrrolidine ring, instead of the usual aryl group derived from aromatic aldehydes. Under silver catalysis the cycloaddition was highly regio- and diastereoselective, affording good yields of the 2,5-cis cycloadducts, with the endo configuration strongly prevailing. The enantioselectivity was controlled by the acetal stereocenter of the pyranone: the (S)-isomer gave a pyrrolidine with a defined configuration for the four asymmetric ring carbons, while the (R)-dihydropyranone gave the enantiomeric ring. A sequence of reactions applied to the cycloadducts derived from (S)-enone afforded the target 2,3,4,5-tetra(hydroxyalkyl)pyrrolidines. The enantiomers were obtained from cycloadducts synthesized from the (R)-enone. The pyrrolidines were evaluated as inhibitors of the ?-galactofuranosidase from Penicillium fellutanum.
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Key Words
ENZYME INHIBITONAZOMETHINE YLIDE1,3-DIPOLAR CYCLOADDITIONSUGAR ENONEHYDROXYPYRROLIDINE
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