作者:S. A. Sokov、I. S. Odin、S. S. Zlotski、A. G. Denisova、A. A. Golovanov
DOI:10.1134/s107042802110002x
日期:2021.10
Abstract Electron-deficient conjugated enynes reacted with diazomethane under mild conditions at the C=C double bond to give the corresponding nitrogen-containing cycloadducts or cyclopropanes. The product structure depended on the number of electron-withdrawing groups at the double bond of the initial enyne. 1,5-Diarylpent-2-en-4-yn-1-ones were converted to 4,5-dihydro-1H-pyrazoles, propargylidenemalonic
摘要 缺电子共轭烯炔与重氮甲烷在温和条件下在 C=C 双键上反应,得到相应的含氮环加合物或环丙烷。产物结构取决于初始烯炔双键处吸电子基团的数量。1,5-Diarylpent-2-en-4-yn-1-ones 转化为 4,5-dihydro-1 H -pyrazoles,propargylidenemalonic acid 衍生物产生 4,5-dihydro-3 H - pyrazoles,和 5 ,7-二氧杂螺[2.5]辛烷-4,8-二酮是由 Meldrum 酸的烯炔衍生物形成的。开发了非催化方法以 75-90% 的产率合成螺环环丙烷和乙炔基取代的二氢吡唑。