Alkylidene Dihydropyridines As Synthetic Intermediates: Model Studies toward the Synthesis of the Bis(piperidine) Alkaloid Xestoproxamine C
作者:Ashabha I. Lansakara、S. V. Santhana Mariappan、F. Christopher Pigge
DOI:10.1021/acs.joc.6b01269
日期:2016.11.4
bis(piperidine) ring system. Other key features of these model studies include development of an efficient ring-closing metathesis procedure to prepare macrocyclic derivatives of 3,4-disusbstituted pyridines, intramolecular cyclizations of alkylidene dihydropyridines to establish pyridine-substituted pyrrolidines and piperidines, successful homologation of pyridine-4-carboxaldehydes using formaldehyde dimethyl
提出了模型研究结果,该研究表明了立体选择性合成路线为双(哌啶)生物碱异托乐明C的三环类似物。三环吡啶衍生物的脱芳香化反应得到亚烷基二氢吡啶(脱水碱)中间体,然后进行催化非均相氢化,以建立有关双(哌啶)环系统的正确相对立体化学。这些模型研究的其他关键特征包括开发一种有效的闭环复分解程序以制备3,4-取代的吡啶的大环衍生物,亚烷基二氢吡啶的分子内环化以建立吡啶取代的吡咯烷和哌啶,吡啶4的成功同源化使用甲醛二甲基硫代乙缩醛一氧化碳(FAMSO)的甲醛