α-Nitro Ketone as an Electrophile and Nucleophile: Synthesis of 3-Substituted 2-Nitromethylenetetrahydrothiophene and -tetrahydrofuran as <i>Drosophila</i> Nicotinic Receptor Probes
作者:Nanjing Zhang、Motohiro Tomizawa、John E. Casida
DOI:10.1021/jo035457g
日期:2004.2.1
-tetrahydrofuran 3 were synthesized through novel approaches using α-nitro ketone intermediates as an electrophile and nucleophile, respectively. The 2-nitromethylenetetrahydrothiophene 2 was formed exclusively as the Z-isomer through intramolecular attack by a thiol substituent at the carbonyl group of an α-nitro ketone, in which the α-nitro ketone served as an electrophile. In contrast, the corresponding
使用α-硝基酮中间体分别作为亲电子试剂和亲核试剂,通过新颖的方法合成了3-(6-氯吡啶吡啶-3-基)甲基-2-硝基亚甲基四氢噻吩2和-四氢呋喃3。2-硝基亚甲基四氢噻吩2是通过α-硝基酮的羰基上的硫醇取代基通过分子内攻击而仅作为Z-异构体而形成的,其中α-硝基酮用作亲电子试剂。与此相反,相应的2- nitromethylenetetrahydrofuran 3,而不是由上述路由访问由于有限的稳定性,制备的混合物ë -和ž通过α-硝基酮烯醇阴离子的分子内攻击形成β-异构体,其中去质子化的α-硝基酮充当亲核试剂。这些化合物与相应的2-硝基亚甲基吡咯烷(1)一起用于探测果蝇新烟碱-烟碱乙酰胆碱受体的相互作用。