A SYNTHESIS OF THE PYRANO[3,2-<i>b</i>]PYRIDINE RING SYSTEM UNDER MILD CONDITIONS
作者:Lalgudi S. Harikrishnan、Terri L. Boehm、H. D. Hollis Showalter
DOI:10.1081/scc-100000577
日期:2001.1
relatively rare pyrano[3,2-b]pyridin-4-one template (1) is described starting from 3-hydroxypyridine. This synthesis allows for varying the substituents at the 2- and 3-positions of the bicycle. A diisopropylsilyloxy moiety was employed to direct lithiation of a pyridine intermediate to the less favored 2-position.
描述了从 3-羟基吡啶开始制备相对稀有的 pyrano[3,2-b]pyridin-4-one 模板 (1) 的路线。这种合成允许改变自行车的 2 位和 3 位上的取代基。使用二异丙基甲硅烷氧基部分将吡啶中间体锂化到不太有利的2-位。