作者:Jehrod B. Brenneman、Rainer Machauer、Stephen F. Martin
DOI:10.1016/j.tet.2004.06.021
日期:2004.8
A concise synthesis of the potent nAChR agonist (+)-anatoxin-a (1) has been completed by a series of nine chemical operations and in 27% overall yield from commercially available d-methyl pyroglutamate (12). The strategy featured the application of a new protocol for the diastereoselective synthesis of cis-2,5-disubstituted pyrrolidines bearing unsaturated side chains and an intramolecular enyne metathesis
有效的n AChR激动剂(+)-毒素-a(1)的简明合成已通过一系列九次化学操作完成,并且可从市售的d-甲基焦谷氨酸(12)中获得27%的总收率。该策略的非对映合成功能的新的协议的应用顺式-2,5-二取代的吡咯烷轴承不饱和侧链和分子内烯炔复分解以提供桥接的双环框架1。因此,焦磷酸谷氨酸甲酯(12)在五个步骤中转化为32,然后进行了简单的烯炔复分解以生成双环二烯33。在33中较少取代的碳-碳双键的选择性氧化裂解,然后脱保护得到的(+)-毒素A(1)。