Carbocyclic Ribosylamines: Synthesis of 5-Substituted Carbocyclic β-Ribofuranosylamines
作者:James T. Slama、Nimish Mehta、Ewa Skrzypczak-Jankun
DOI:10.1021/jo060920l
日期:2006.9.1
exo-face of the olefin, yielding hydroxylation products that can be converted into analogues of carbocyclic ribosides. Conversely, a sterically small protecting group permits OsO4 approach from the endo-face, yielding hydroxylation products analogous to carbocyclic lyxosides. A key intermediate for carbocyclic sugar production, (1S,2S,3R, 4R,5S)-1-(tert-butyloxycarbonyl)amino-5-bromo-2,3-(dimethylmeth
开发了5'-取代的碳环核苷类似物的5-取代的环戊胺前体的合成。我们表明,的OsO的立体化学4的顶部溴化内酰胺的催化的羟基化,7-溴-2-氮杂双环[2.2.1]庚-5-烯-3-酮,可以通过内酰胺的适当选择控制NH保护基。较大的立体基团将羟基化作用引导至烯烃的外表面,从而产生可以转化为碳环核糖苷类似物的羟基化产物。相反,空间小的保护基团允许OsO 4从内表面进入,产生类似于碳环lyxosides的羟基化产物。碳环糖生产的关键中间体(1 S,2 S,3 R,4 R,5 S)-1-(叔丁氧基羰基)氨基-5-溴-2,3-(二甲基亚甲基)二氧基-4-羟甲基环戊烷是从对映体纯的内酰胺开始合成的,(1 S)-(+)-2-氮杂双环[2.2.1]庚-5-烯-3-酮,分七个步骤,总收率为21%。