5(6)-<i>anti</i>-Substituted-2-azabicyclo[2.1.1]hexanes: A Nucleophilic Displacement Route
作者:Grant R. Krow、Ram Edupuganti、Deepa Gandla、Amit Choudhary、Guoliang Lin、Philip E. Sonnet、Charles DeBrosse、Charles W. Ross、Kevin C. Cannon、Ronald T. Raines
DOI:10.1021/jo901725k
日期:2009.11.6
Nucleophilic displacements of 5(6)-anti-bromo substituents in 2-azabicyclo[2.1.1]hexanes (methanopyrrolidines) have been accomplished. These displacements have produced 5-anti-X-6-anti-Y-difunctionalized-2-azabicyclo[2.1.1]hexanes containing bromo, fluoro, acetoxy, hydroxy, azido, imidazole, thiophenyl, and iodo substituents. Such displacements of anti-bromide ions require an amine nitrogen and are
2-氮杂双环[2.1.1]己烷(甲基吡咯烷)中5(6)-反溴取代基的亲核置换已经完成。这些置换产生了含有溴、氟、乙酰氧基、羟基、叠氮基、咪唑、苯硫基和碘取代基的5-抗-X-6-抗-Y-二官能化-2-氮杂双环[2.1.1]己烷。反溴离子的这种置换需要胺氮并且是溶剂和金属盐的选择的函数。与 DMF 相比,DMSO 的反应速率更快,产物收率更高;与 NaOAc 相比,CsOAc 的反应速率更快,产物收率更高。钠盐或锂盐可得到产物,但 NaF 除外,其中硝基甲烷中的氟化银最适合被氟化物取代。6-反位上吸电子F、OAc、N 3、Br或SPh取代基的存在减缓了5-反位上的溴化物置换。