Synthesis of the necine bases (±)-macronecine and (±)-supinidine via an aza-ene reaction and allylsilane induced ring closure
作者:Tarun K. Sarkar、Anindya Hazra、Pulak Gangopadhyay、Niranjan Panda、Zdenek Slanina、Chun-Cheng Lin、Hui-Ting Chen
DOI:10.1016/j.tet.2004.11.046
日期:2005.1
An aza-ene reaction has been used for the first time for the synthesis of two 5-membered lactam-hydrazides, each with a built-in allylsilane terminator for further elaboration. One of the lactam-hydrazides was transformed via an allylsilane-hydrazonium ion ring closure to a fused tetrahydropyrazole which may be considered as a mono-nitrogen analog of the biologically significant necine bases. A density
氮杂烯反应已首次用于合成两个5元内酰胺-酰肼,每个均带有内置的烯丙基硅烷终止剂以进一步加工。内酰胺-酰肼之一通过烯丙基硅烷-ion离子闭环转化为稠合的四氢吡唑,其可以被认为是生物学上重要的烟碱的单氮类似物。进行了密度泛函理论研究(B3LYP / 6-21G *),以洞悉有助于形成四氢吡唑的离子中间体的向斜过渡结构的因素。该立体控制的合成充当了另一种内酰胺-酰肼,取代的2-吡咯烷酮多步转化为烟碱(±)-亚磺啶和(±)-Macronecine的模型。