Heterogeneous copper-catalyzed three-component reaction of 2-aminopyridines, acetophenones and benzyl cyanide towards 3-cyanoimidazo[1,2-a]pyridines
作者:Bingbo Niu、Chongren You、Bin Huang、Mingzhong Cai
DOI:10.1016/j.catcom.2019.01.025
日期:2019.4
The heterogeneous three-componentreaction of 2-aminopyridines, acetophenones and benzyl cyanide was achieved in NMP at 120 °C by using an MCM-41-anchored L-proline‑copper(I) complex [MCM-41-L-Proline-CuI] as catalyst under air, yielding a wide variety of 3-cyanoimidazo[1,2-a]pyridines in moderate to high yields. The new heterogeneous copper catalyst exhibited higher catalytic activity than CuI, and
的2-氨基吡啶,苯乙酮和苄基氰的非均相三组分反应在NMP中在120℃下通过使用MCM-41锚定实现大号-脯氨酸-铜(I)配合物[MCM-41-大号-脯氨酸翠在空气中作为催化剂,以中等至高收率产生了多种3-氰基咪唑并[1,2- a ]吡啶。新的非均相铜催化剂显示出比CuI更高的催化活性,并且可以以几乎恒定的活性循环至少八次。
Electrochemical Oxidative Regioselective C–H Cyanation of Imidazo[1,2-<i>a</i>]pyridines
作者:Ting Cui、Yanling Zhan、Changhui Dai、Jun Lin、Ping Liu、Peipei Sun
DOI:10.1021/acs.joc.0c03026
日期:2021.11.19
Electrochemical oxidative regioselective C–H cyanation of imidazo[1,2-a]pyridines was developed using readily available TMSCN as the cyano source. The KH2PO4/K2HPO4 buffer was essential for this transformation. This protocol was compatible with a broad range of substituted imidazo[1,2-a]pyridines and provided the C3 cyanated products in moderate to excellent yields.
咪唑并[1,2- a ]吡啶的电化学氧化区域选择性C-H氰化是使用现成的TMSCN作为氰基源开发的。KH 2 PO 4 /K 2 HPO 4缓冲液对于这种转化是必不可少的。该方案与多种取代的咪唑并[1,2- a ]吡啶兼容,并以中等至优异的产率提供C3氰化产物。