Vares L, Rein T
Department of Organic Chemistry, Kemitorvet, Technical University of Denmark, Kgs. Lyngby.
Org Lett. 2000 Aug 24;2(17):2611-4. doi: 10.1021/ol006135r.
[reaction: see text]An approach to chiral tetrahydrofuran and tetrahydropyran derivatives is reported which is based on the sequential use of an asymmetric Horner-Wadsworth-Emmons desymmetrization of a meso-dialdehyde and a palladium-catalyzed intramolecular allylic substitution. The strategy is versatile in that either a cis- or a trans-relation between the stereocenters adjacent to the ring oxygen can be obtained.
[反应:见正文] 报道了一种合成手性四氢呋喃和四氢吡喃衍生物的方法,该方法基于对中-二醛进行不对称霍纳-沃兹沃思-埃蒙斯去对称化反应与钯催化的分子内烯丙基取代反应的顺序使用。该策略具有通用性,因为可以得到与环氧化合物相邻的立体中心之间的顺式或反式关系。