Journal
MOLECULES
Volume 28, Issue 5, Pages -Publisher
MDPI
DOI: 10.3390/molecules28052414
Keywords
sulfinyl imines; decarboxylative Mannich reaction; cyclization; organocatalysis; homotropanone alkaloids
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The stereocontrolled synthesis of 1-substituted homotropanones was achieved using chiral N-tert-butanesulfinyl imines as intermediates. Key steps in this methodology include the reaction of organolithium and Grignard reagents with hydroxy Weinreb amides, chemoselective N-tert-butanesulfinyl aldimine formation from keto aldehydes, decarboxylative Mannich reaction with beta-keto acids of these aldimines, and organocatalyzed L-proline intramolecular Mannich cyclization. The utility of the method was demonstrated with the synthesis of (-)-adaline and its enantiomer (+)-adaline.
The stereocontrolled synthesis of 1-substituted homotropanones, using chiral N-tert-butanesulfinyl imines as reaction intermediates, is described. The reaction of organolithium and Grignard reagents with hydroxy Weinreb amides, chemoselective N-tert-butanesulfinyl aldimine formation from keto aldehydes, decarboxylative Mannich reaction with beta-keto acids of these aldimines, and organocatalyzed L-proline intramolecular Mannich cyclization are key steps of this methodology. The utility of the method was demonstrated with a synthesis of the natural product (-)-adaline, and its enantiomer, (+)-adaline.
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