A metal-free protocol of direct C(sp3)–H cyanation with cyanobenziodoxolones functioning as both cyanating reagents and oxidants was developed. Unactivated substrates, such as alkanes, ethers and tertiary amines, were thereby transformed to the corresponding nitriles in moderate to high yields. Mechanistic studies indicated that the cyanation proceeded with two potential pathways, which is highly dependent
sp3C–H bonds at the α position of amines was achieved using CoCuFe2O4 as a catalyst and NaCN as an inexpensive cyanide source at room temperature. CoCuFe2O4 was found to be an active catalyst for Csp [3]-Cspcoupling, efficiently delivering valuable α-aminonitriles from tertiary/secondary amines in good yields. The corresponding products were obtained with high selectivity toward α position. In addition
在室温下,使用CoCuFe 2 O 4作为催化剂,使用NaCN作为廉价的氰化物源,可实现胺α位处sp 3 C–H键的氧化氰化。 发现CoCuFe 2 O 4是Csp [3] -Csp偶联的活性催化剂,可有效地以高收率从叔胺/仲胺传递有价值的α-氨基腈。获得了对α位置具有高选择性的相应产物。此外,官能团耐受性为生物活性分子的后期功能化应用提供了机会。这种转化以克为单位方便地进行,并且该催化剂可以在具有恒定催化活性的情况下重复使用几次。