作者:Lutz F Tietze、Uwe Beifuss
DOI:10.1016/s0040-4039(00)84369-5
日期:1986.1
Lewis-acid catalyzed intramolecular ene reactions 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.
1,7-二烯6a-d中的手性,双活化的亲和体发生热和路易斯酸催化的分子内烯反应,生成反式环己烷7a-d和8a-d。非对映选择性的程度取决于反应温度。1,7-二烯6是通过香茅醛5与无环的1,3-二羰基化合物和类似化合物4的Knoevenagel缩合获得的。然而,从二烯6e开始,发生分子内杂Diels-Alder反应。