作者:Stephanie Seel、Tobias Thaler、Keishi Takatsu、Cong Zhang、Hendrik Zipse、Bernd F. Straub、Peter Mayer、Paul Knochel
DOI:10.1021/ja201008e
日期:2011.4.6
A highly diastereoselective methodology for the preparation of various substituted piperidines via Negishi cross-couplings with (hetero)aryl iodides was developed. Depending on the position of the C-Zn bond relative to the nitrogen (position 2 vs position 4), the stereoselectivity of the coupling can be directed toward either the trans- or cis-2,4-disubstituted products. Density functional theory calculations
开发了一种通过 Negishi 与(杂)芳基碘化物交叉偶联制备各种取代哌啶的高度非对映选择性方法。根据 C-Zn 键相对于氮的位置(位置 2 与位置 4),偶联的立体选择性可以指向反式或顺式 2,4-二取代产物。对锌和钯中间体的相对稳定性进行了密度泛函理论计算,以解释获得的高非对映选择性。一种新的 Pd 1,2-迁移进一步扩展了该方法的立体选择性制备 5-芳基-2,5-二取代哌啶。