Synthesis of four stereoisomers of the higher dipteran juvenile hormone III bisepoxide
摘要:
The 6S,7S,10R-, 6S,7S,10S-, 6R,7R,10S- and 6R,7R,10R-stereoisomers of the juvenile hormone III bisepoxide from higher Dipteran insects have been synthesised in high stereoisomeric purity. The route involves Sharpless epoxidation of geraniol to enantiomeric epoxyalcohols, which are each elaborated via separable diastereomeric bromohydrins.
Regio- and stereoselective rearrangement reactions of various α,β-epoxy acylates including acyclic, monocyclic and bicyclic systems occurred under a suitable combination of acyl groups (benzoyl, p-nitrobenzoyl, camphanoyl) and Lewis acids (BF3·Et2O, MABR).