The isolation and structure determination of eldanolide, the wing gland pheromone of the male African Sugar Cane Borer, Eldana saccharina (Wlk.) is described. The absolute configuration was determined as (3S, 4R) by comparison of the CD spectra of the natural pheromone with both synthetic enantiomers.
1,3-Dipolar cycloadditions of 2-deoxy-D-ribose-derived L-threo five-membered cyclic nitrone to α,β-unsaturated γ- and δ-lactones were investigated. Cycloadducts obtained from δ-lactones, after NO bond cleavage, opening of the lactone ring, and protection of hydroxyl groups were subjected to β-lactam ring formation by using Mukaiyama's salt. Cycloadducts from γ-lactones subjected to the same reaction
Absolute configuration of eldanolide, the wing gland pheromone of the male African sugar cane borer, Eldana saccharina (Wlk.) syntheses of its (+) and (−) enantiomers.
We report a new synthesis of 2-deoxy-L-ribose starting from the commercially available (R)-(+)-5-hydroxymethyl-5H-furan-2-one. The key step is a 1,4-addition of (PhMe2Si)(2)Cu(CN)Li-2 which proceeds with complete diastereoselection. (C) 2000 Elsevier Science Ltd. All rights reserved.