One-Pot Access to <i>peri</i>-Condensed Heterocycles via Manganese-Catalyzed Cascade C–N and C–C Bond Formation
作者:Yunliang Yu、Yadong Feng、Remi Chauvin、Shuangshuang Ma、Lianhui Wang、Xiuling Cui
DOI:10.1021/acs.orglett.8b01586
日期:2018.7.20
A Mn(III)-catalyzed three-component cascade C–H/N–H functionalization of 2-aminopyridines with 2 equiv of dialkyl butyndioates leads to peri-condensed tricylic azines through a selective, but partly destructive, stoichiometry. A wide range of 2,11-diazatricyclo[5.3.1.04,11]undeca-1(10),4,6,8-tetraen-3-ones were thus obtained with moderate to high yields in a step-economical fashion under mild conditions
I<sub>2</sub>O<sub>5</sub>-Mediated Iodocyclization Cascade of <i>N</i>-(1-Arylallyl)pyridine-2-amines with Concomitant C═C Bond Cleavage: A Synthesis of 3-Iodoimidazo[1,2-<i>a</i>]pyridines
作者:Bingwei Zhou、Yuan Yuan、Hongwei Jin、Yunkui Liu
DOI:10.1021/acs.joc.9b00765
日期:2019.5.3
A facile method for the synthesis of 3-iodoimidazo[1,2-a]pyridines has been successfully developed involving an I2O5-mediated iodocyclization cascade of N-(1-arylallyl)pyridin-2-amines with concomitant C═Cbondcleavage. Preliminary mechanistic studies reveal that this protocol might undergo an oxidative cyclization/decarboxylation/iodination sequence in which I2O5 is used as both an oxidant and an
已成功开发了一种简便的合成3-碘咪唑并[1,2- a ]吡啶的方法,该方法涉及I 2 O 5介导的N-(1-芳基烯丙基)吡啶-2-胺与C═C的碘环化级联反应键断裂。初步的机理研究表明,该方案可能会经历氧化环化/脱羧/碘化过程,其中I 2 O 5既用作氧化剂,又用作碘源。本协议具有衬底范围广,操作简单和无金属条件的优点。
Catalytic Activation of C−H and C−C Bonds of Allylamines via Olefin Isomerization by Transition Metal Complexes
作者:Chul-Ho Jun、Hyuk Lee、Jae-Bum Park、Dae-Yon Lee
DOI:10.1021/ol990357b
日期:1999.12.1
The metal-catalyzed reaction of olefins with allylamines bearing coordination sites (2-pyridyl groups) was studied. With Ru-3(CO)(12) as catalyst, activation of C-H bonds led to the formation of ketimines that were hydrolyzed to give asymmetric ketones. With [(C8H14)(2)RhCl](2), both C-H and C-C bonds were activated and symmetric ketones were formed on hydrolysis. The reaction involves double bond migration of the allylamine to form an aldimine.