Three‐Component [2+2+1] Gold(I)‐Catalyzed Oxidative Generation of Fully Substituted 1,3‐Oxazoles Involving Internal Alkynes
作者:Alexey Yu. Dubovtsev、Dmitry V. Dar'in、Vadim Yu. Kukushkin
DOI:10.1002/adsc.201900097
日期:2019.6.18
Three‐component [2+2+1] gold(I)‐catalyzed reaction of internal alkynes (alkynyl esters or ‐ketones), nitriles, and 2‐chloropyridine N‐oxide led to a wide range of fully substituted 1,3‐oxazoles (32 examples; up to 92% isolated yields). Nitrile R3CN species, employed in the reaction as both reactants and solvents, comprise conventional nitriles (R3=Alk, Ar) and also push‐pull systems such as cyanamides
三组分[2 + 2 + 1]金(I)催化内部炔烃(炔基酯或酮),腈和2-氯吡啶N-氧化物的反应,导致了各种各样的完全取代的1,3-恶唑(32个示例;高达92%的孤立产率)。反应中既用作反应物又作为溶剂的腈R 3 CN物种包括常规腈(R 3 = Alk,Ar)以及推挽式体系,如氰胺(R 3 = NH 2和NAlk 2)和硫氰酸酯( R 3= SPr)。所开发方法的优点包括反应条件温和,官能团耐受性高,取代基R 1 / R 3范围广当R 1= NH 2时,还有可能容易修饰COR 2或氨基。