Selectivity for Alkynyl or Allenyl Imidamides and Imidates in Copper-Catalyzed Reactions of Terminal 1,3-Diynes and Azides
作者:Sourav Ghorai、Daesung Lee
DOI:10.1021/acs.orglett.0c03861
日期:2021.2.5
Copper-catalyzed reactions of terminal 1,3-diynes with electron-deficient azides to generate either 3-alkynyl or 2,3-dienyl imidamides and imidates are described. The selectivity depends on the diyne substituents and the nucleophile that reacts with the ketenimide intermediate generated from the corresponding triazole precursor. Reactions of 1,3-diynes containing a propargylic acetate afford [3]cumulenyl
描述了末端的1,3-二炔与缺电子的叠氮化物的铜催化反应以生成3-炔基或2,3-二烯基亚酰胺和酰亚胺。选择性取决于二炔取代基和与相应三唑前体生成的酮丁酰亚胺中间体反应的亲核试剂。含有炔丙基乙酸酯的1,3-二炔反应生成[3]枯烯基亚酰胺,而使用甲醇作为捕集剂的反应选择性生成2,3-二烯基酰亚胺。从含有均丙基羟基或胺取代基的1,3-二炔获得五元杂环。