Total Synthesis of Polyamine Toxin HO-416b and Agel-489 Using a 2-Nitrobenzenesulfonamide Strategy.
作者:Yuko HIDAI、Toshiyuki KAN、Tohru FUKUYAMA
DOI:10.1248/cpb.48.1570
日期:——
Total synthesis of spider toxins HO-416b (1) and Agel-489 (2) was accomplished using the 2-nitrobenzenesulfonamide (Ns) group as both a protecting and activating group. In this strategy, the C-N bonds were constructed by alkylation of sulfonamides with alkyl halides or Mitsunobu reaction with the corresponding alcohol.Beginning with monoprotection of the symmetrical diamine, the construction of the backbone from diamine 3 was efficiently accomplished in 7 steps for 14 and 9 steps for 29. Removal of the Ns group while the substrate was attached to a novel solid support enabled the efficient isolation of this highly polar compound.
利用2-硝基苯磺酰胺(Ns)基团作为保护和活化组,完成了蜘蛛毒素HO-416b(1)和Agel-489(2)的全合成。在该策略中,通过烷基卤化物对磺酰胺的烷基化或与相应醇的Mitsunobu反应构建了C-N键。从对称的二胺的单保护开始,二胺3骨架的构建在14个步骤中高效完成,29个步骤中完成9步。当底物附着在新型固相载体上时,Ns基团的去除使得这种极性化合物的高效分离成为可能。