5-formyl-δ—valerolactone: A useful synthon for the chiral synthesis of the vespa orientalis pheromone and the mosquito oviposition attractant pheromone
Abstract A synthetic scheme starting from the reaction between the lithiated N-allyl-N-methyl- (bisdimethylamino) phosphoramide anion and the triflate derivative of (R)-(-)-or (S)-(+)-2, 3- O-isopropylideneglycerol is described to prepare the key chiral synthon (R)-5-or (S)-5-formyl-