1,4-Bis(arylsulfonyl)-1,2,3,4-tetrahydropyridines in Synthesis. Highly Regio- and Stereoselective S<sub>N</sub>1′ and Alkylation Reactions
作者:Donald Craig、Raymond McCague、Gerard A. Potter、Meredith R. V. Williams
DOI:10.1055/s-1998-1566
日期:1998.1
4-tetrahydropyridines 3 in good yields. These heterocyclic substrates react efficiently and highly stereoselectively with a range of carbon nucleophiles under Lewis acidic conditions to give the 1,2,5,6-tetrahydropyridine products of SN1′ reaction, and undergo lithiation followed by completely stereoselective reaction at the 4-position with haloalkanes.
锂化 β-磺酰基缩醛与氨基酸衍生的 N-甲苯磺酰基氮丙啶反应,然后酸催化环化,以良好的产率得到对映异构纯的 2-烷基 1,4-双(芳基磺酰基)-1,2,3,4-四氢吡啶 3。这些杂环底物在路易斯酸性条件下与一系列碳亲核试剂有效且高度立体选择性地反应,得到 SN1' 反应的 1,2,5,6-四氢吡啶产物,并进行锂化,然后在 4-位完全立体选择性地反应与卤代烷。