Asymmetric synthesis of (+)-(S)-Massoia lactone, pheromone of Idea leuconoe. Formal total synthesis of valilactone and lachnelluloic acid
作者:I. V. Mineeva
DOI:10.1134/s1070428013110146
日期:2013.11
Simple and efficient asymmetric synthesis was developed of the cyclic scaffold of (-)-valilactone, an effective inhibitor of the pancreas lipase, applying the Keck allylation in the key stage of building up the carbon skeleton of the target molecule and of the unnatural (S)-isomer of Massoia lactone, lachnelluloic acid, possessing fungicidal properties, and (5R,7S)-7-hydroxy-5-dodecanolid, pheromone
Males of the giant white butterfly Idea leuconoe release a complex mixture of compounds during courtship. Besides alkaloids, aromatics, terpenoids and hydrocarbons, several lactones have been identified in the pheromone bouquet. Two simple stereoselective methods to create the lactones in good enantiomeric excesses have been developed. The generation of the stereocenters of the beta-lactones 1a and 1b is based on a controlled C-C coupling by a Horner-Wadsworth-Emmons approach, followed by asymmetric dihydroxylation, whereas the synthesis of the delta-lactone 3b uses an enantioselective hydrogenation of a dioxoalkanoate precursor. The absolute configurations of the natural lactones 1a, 1b and 3b were determined by gas chromatography on a chiral stationary phase. Both 1a and 1b are of (S,S) configuration, suggesting their biosynthetic origin from (-)-viridifloric acid (7a) or (-)norviridifloric acid (7b), respectively. In contrast, natural 3b is a mixture of all enantiomers, in which the (5S,7S) enantiomer dominates.
SIGNORELLA, SANDRA R.;CRAVERO, RAQUEL M.;SALA, LUIS F.;RUVEDA, EDMUNDO A., SYNTH. COMMUN., 18,(1988) N 16-17, C. 1935-1945
作者:SIGNORELLA, SANDRA R.、CRAVERO, RAQUEL M.、SALA, LUIS F.、RUVEDA, EDMUNDO A.
DOI:——
日期:——
Signorella, Sandra R.; Cravero, Raquel M.; Sala, Luis F., Synthetic Communications, 1988, vol. 18, # 16-17, p. 1935 - 1946
作者:Signorella, Sandra R.、Cravero, Raquel M.、Sala, Luis F.、Ruveda, Edmundo A.