Y. Yamamoto et al., Synthetic studies on azadirachtin: An efficient asymmetric synthesis of the highly functionalized tricyclic decalin part of azadirachtin, SYNTHESIS-S, (13), 2000, pp. 1894-1906
The detailed examination of intramolecular Diels-Alder reactions of several
structurally related trienes led to construction of the desired tricyclic
decalin moiety of azadirachtin with the alpha -hydroxyl groups at C1 and C3
as well as the oxygenated substituent at C8 in the naturally occurring for
m in good yields.