Synthesis of 3-aryl-2-phosphinoimidazo[1,2-<i>a</i>]pyridine ligands for use in palladium-catalyzed cross-coupling reactions
作者:Ryan Q. Tran、Seth A. Jacoby、Kaitlyn E. Roberts、William A. Swann、Nekoda W. Harris、Long P. Dinh、Emily L. Denison、Larry Yet
DOI:10.1039/c9ra02200g
日期:——
3-Aryl-2-phosphinoimidazo[1,2-a]pyridine ligands were synthesized from 2-aminopyridine via two complementary routes. The first synthetic route involves the copper-catalyzed iodine-mediated cyclizations of 2-aminopyridine with arylacetylenes followed by palladium-catalyzed cross-coupling reactions with phosphines. The second synthetic route requires the preparation of 2,3-diiodoimidazo[1,2-a]pyridine or 2-iodo-3-bromoimidazo[1
3-芳基-2-膦基咪唑并[1,2- a ]吡啶配体由2-氨基吡啶通过两条互补的路线合成。第一条合成路线涉及铜催化的碘介导的 2-氨基吡啶与芳基乙炔的环化反应,然后是钯催化的与膦的交叉偶联反应。第二种合成路线需要制备2,3-二碘咪唑并[1,2- a ]吡啶或2-碘-3-溴咪唑[1,2- a ]] 吡啶从 2-氨基吡啶,然后分别是钯催化的 Suzuki/亚膦化或亚膦化/Suzuki 交叉偶联反应序列。用这些配体介绍了 Suzuki 合成空间位阻联芳基和 Buchwald-Hartwig 胺化化合物的初步模型研究。