Controlled endocyclic and exocyclic γ-metalations of β-substituted cyclohexenyl sulfones. Regiospecific syntheses of γ-oxygenated cyclohexenyl sulfones.
摘要:
Beta-Substituted cyclohexenyl sulfones may be regiospecifically isomerized to either endocyclic or exocyclic allyl sulfones. Epoxidation of these materials followed by a second metalation yields gamma-hydroxy cyclohexenyl sulfones 6 and 7. Subjection of either of these materials to a second oxidation/isomerization sequence smoothly provides the bis gamma-hydroxylated cyclohexenyl sulfone 10 in excellent overall yield.