Kj. Henry et B. Fraserreid, FREE-RADICAL METHODOLOGY FOR CARBOHYDRATE TO CARBOCYCLE TRANSFORMATIONS - AN EFFICIENT SYNTHESIS OF THE TRICYCLIC DIHYDROFURAN PORTION OF AZADIRACHTIN, Journal of organic chemistry, 59(18), 1994, pp. 5128-5129
Iodo lactone 6b, derived from D-galactal, undergoes tin hydride mediat
ed transannular radical cyclization to give the tricyclic lactone 7, w
hich is easily converted into an advanced precursor of the tricyclic d
ihydrofuran portion of the potent insect antifeedant azadirachtin (1).