Intramolecular ene reactions. 7. Asymmetric induction in intramolecular ene reactions of chiral 1,7-dienes: a diastereo- and enantioselective synthesis of substituted cyclohexanes
Asymmetric induction in intramolecular ene reactions of 1,7-dienes
作者:Lutz F Tietze、Uwe Beifuss
DOI:10.1016/s0040-4039(00)84369-5
日期:1986.1
Lewis-acid catalyzed intramolecularenereactions yielding trans-cyclohexanes 7a-d and 8a-d. The extent of diastereoselectivity depends on the reaction temperature. The 1,7-dienes 6 are obtained via Knoevenagel condensation of citronellal 5 with acyclic 1,3-dicarbonyls and analogous compounds 4. Starting with the diene 6e, however, an intramolecular hetero-Diels-Alder reaction takes place.
Intramolecular ene reactions. 7. Asymmetric induction in intramolecular ene reactions of chiral 1,7-dienes: a diastereo- and enantioselective synthesis of substituted cyclohexanes