Highly efficient terpenoid pheromone syntheses via regio- and stereocontrolled processing of allyllithiums generated by reductive lithiation of allyl phenyl thioethers
摘要:
Previous work had shown that reductive lithiation of allyl phenyl thioethers, followed by transmetallation, produces allylmetallics which react selectively with carbonyl compounds at the most or least substituted terminus; the latter results in mainly cis olefin. This technology allows extremely efficient syntheses of racemic versions of lavandulol (two-pot, 70% yield), the Comstock mealy bug pheromone (one-pot, 45% yield) and the California red scale pheromone (4-steps, 23% yield).