Regioselectivity, scope, and limitations of the addition of organolithium and allylmagnesium reagents to 1H-pyridine-2-thiones; access to 3,4-, 3,6-, and 5,6-dihydropyridine-2-thiones
作者:Jacek G. Sośnicki
DOI:10.1016/j.tet.2007.09.029
日期:2007.11
Organolithium and lithium allyldibutylmagnesate reagents add to readily available NH, NMe, NBn, and NPh substituted pyridine-2-thiones yielding 4- and/or 6-substituted 3,4- or 3,6-dihydropyridine-2-thiones, respectively. The regioselectivity of the addition is dependent on the solvent, temperature, substituent at the nitrogen, and the type or organometallic reactant used, and allows tailoring of both
烯丙基二丁基镁的有机锂和锂试剂添加到容易获得的NH,NMe,NBn和NPh取代的吡啶-2-硫酮中,分别产生4-和/或6-取代的3,4-或3,6-二氢吡啶-2-硫酮。加成物的区域选择性取决于溶剂,温度,氮上的取代基以及所用的类型或有机金属反应物,并允许对两种体系进行定制。将6-取代的β,γ-不饱和δ-硫代内酰胺简单地转化为它们的α,β-不饱和异构体,使得上述方法成为一种高度通用的合成方法,可用于获得6-取代的5,6-二氢吡啶-2-硫酮-有价值的Michael受体。