Synthesis of the structures proposed for natural butanolides piliferolides A and C
摘要:
The structures proposed for natural butanolides piliferolides A and C have been synthesized. The allylic and lactone stereogenic centers in the target structures were derived from D-mannitol, while that near the side-chain terminal was taken from (R)-propylene oxide. The synthetic samples helped to reveal that a signal at around delta 2.0 ppm was missing in the H-1 NMR data listing for the structures proposed for natural piliferolides, whereas the delta 29.7 ppm signal in the C-13 NMR reported for the structure proposed for natural piliferolide C most likely stemmed from the impurities in the chromatography solvent. (C) 2011 Elsevier Ltd. All rights reserved.
A Concise Enantiocontrolled Route to (+)-Patulolide C
摘要:
A naturally occurring antifungal macrolide (+)-patulolide C has been synthesized enantioselectively via the C-2-symmetric bis-epoxide by incorporation of two molecular units of (R)-0-benzylglycidol.