作者:Karen A. Johnston、Robert W. Allcock、Zhong Jiang、Ian D. Collier、Haakon Blakli、Georgina M. Rosair、Patrick D. Bailey、Keith M. Morgan、Yasushi Kohno、David R. Adams
DOI:10.1039/b713638b
日期:——
Cycloaddition of pyridine N-imine with 6-alkyl-4-oxohex-5-ynoates followed by condensation with hydrazine provides concise access to pharmacologically active 6-(pyrazolo[1,5-a]pyridin-3-yl)pyridazinones. For the first time alkynyl heterocycles are also shown to be effective dipolarophiles for pyridine N-imine, and analogous compounds can be accessed directly in modest yields through the reaction of 6-(alkyn-1-yl)pyridazin-3-one derivatives.
吡啶 N-亚胺与 6-烷基-4-氧代己酮-5-炔酸盐进行环加成反应,然后与肼缩合,可以简便地获得具有药理活性的 6-(吡唑并[1,5-a]吡啶-3-基)哒嗪酮。研究首次证明,炔基杂环也是吡啶 N-亚胺的有效双极性亲和剂,通过 6-(炔-1-基)哒嗪-3-酮衍生物的反应,可以直接获得类似的化合物,产量并不高。