A general synthetic route towards bastadins. Part 2: Synthesis of the western part of bastadins 4–16, and fully functionalized macrocycle of bastadin 12
作者:Elias A. Couladouros、Vassilios I. Moutsos
DOI:10.1016/s0040-4039(99)01430-6
日期:1999.9
A general synthetic route for the construction of the western part of the macrocyclic bastadins 4–16 is presented. The western and the eastern segements were coupled using the imidazolide of the corresponding acid. The bromine at position Y2 may be added at this advanced step regiospecifically, strengthening the convergence of the presented approach. Finally, the fully functionalized α,ω-aminoacid
介绍了大环巴斯塔丁4–16西部构建的一般合成路线。使用相应酸的咪唑内酯偶联西方和东方部分。可以在该高级步骤上区域特异性地添加位置Y 2处的溴,从而增强了所提出方法的收敛性。最后,用EDC使完全官能化的α,ω-氨基酸环化,以72%的收率(总收率3.5%)得到basastin-12的大环。