Enantioselective synthesis of the tricyclic furan moiety of azadirachtin, a potent insect antifeedant
作者:Hidenori Watanabe、Takeru Watanabe、Kenji Mori
DOI:10.1016/0040-4020(96)00856-3
日期:1996.10
A synthesis of the enantiomerically pure right-hand part (2) of an insectantifeedant, azadirachtin, is described. Reduction with baker's yeast was demonstrated to be efficient for kinetic resolution of racemic diketone (4) to give 3 of ∼75% e.e., from which was derived 2 in 11 steps.
New bicyclic γ- and δ-aminoalcohols as catalysts for the asymmetric diethylzinc addition to benzaldehyde
作者:Cecilia Olsson、Sara Helgesson、Torbjörn Frejd
DOI:10.1016/j.tetasy.2008.06.002
日期:2008.6
A newclass of chiral non-racemic γ- and δ-amino alcohols based on bicyclo[2.2.1]heptane and bicyclo[2.2.2]octane have been synthesized and used as catalysts in the asymmetric diethylzinc addition to benzaldehyde.
Chemistry of insect antifeedants from azadirachta indica (part 6): Synthesis of an optically pure acetal intermediate for potential use in the synthesis of azadirachtin and novel antifeedants.
作者:James C Anderson、Steven V Ley
DOI:10.1016/s0040-4039(00)94574-x
日期:1990.1
For potential use in a synthesis of the antifeedantazadirachtin (1) and novel antifeedants, a key tricyclic acetal intermediate (2) has been prepared in optically pure form in 12 steps from the known (−)−3-endo-bromotricyclo[3.2.0.02,7]heptan-6-one (3).
Bicyclic diols and related derivatives as catalysts for the asymmetric diethylzinc addition to benzaldehyde
作者:Cecilia Olsson、Annika Friberg、Torbjörn Frejd
DOI:10.1016/j.tetasy.2008.05.024
日期:2008.6
Chiral bicyclic diols based on bicyclo[2.2.2]octane and bicyclo[2.2.1]heptane have been synthesized and their catalytic capacity in the asymmetric diethylzinc addition to benzaldehyde compared with those described for previously synthesized 2,6-bicyclo[2.2.2]octane-diols (BODOLs). The influence of the number of coordinating sites and the distance between them were studied. (C) 2008 Elsevier Ltd. All rights reserved.
Metabolic switching in cyctochrome P-450cam: deuterium isotope effects on regiospecificity and the monooxygenase/oxidase ratio