N. Kanoh et al., Synthetic studies on azadirachtin: Asymmetric synthesis of the tetracyclicdecalin part of azadirachtin, SYNTHESIS-S, (13), 2000, pp. 1878-1893
A synthesis of the tetracyclic decalin part of azadirachtin in the naturall
y occurring form is described. The key reactions involve the Corey-Bakshi-S
hibata (CBS) asymmetric reduction of the ketone, and an intramolecular Diel
s-Alder (IMDA) reaction.