Catalyst-Free Annulation of 2-Pyridylacetates and Ynals with Molecular Oxygen: An Access to 3-Acylated Indolizines
摘要:
A catalyst and additive-free annulation of 2-pyridylacetates and ynals under molecular oxygen was the first developed, affording 3-acylated indolizines in good to excellent yields. Molecular oxygen was used as the source of the carbonyl oxygen atom in indolizines. This approach was compatible with a wide range of functional groups, and especially it has been successfully extended to unsaturated double bonds and triple bonds, which were difficult to prepare by previous methods in a single step.
Iron(III)-catalyzed synthesis of 3-aroylimidazo[1,2-a]pyridines from 2-aminopyridines and ynals
作者:Zhengwang Chen、Botao Liu、Pei Liang、Zhixiong Yang、Min Ye
DOI:10.1016/j.tetlet.2018.01.018
日期:2018.2
An efficient iron-catalyzed intermolecular aminooxygenation of 2-aminopyridines with a wide range of ynals has been developed. 3-Aroylimidazo[1,2-a]pyridines containing various functional groups are synthesized under the standard conditions. The transformation is conducted in simple conditions and forms products in good yields.
已经开发了具有广泛的烯醛的2-氨基吡啶的有效铁催化的分子间氨基氧化。在标准条件下合成含有各种官能团的3-芳基咪唑并[1,2- a ]吡啶。该转化在简单的条件下进行,并以高收率形成产物。
Gold-Catalyzed Annulation/Fragmentation: Formation of Free Gold Carbenes by Retro-Cyclopropanation
作者:César R. Solorio-Alvarado、Antonio M. Echavarren
DOI:10.1021/ja104743k
日期:2010.9.1
The gold(I)-catalyzed cyclization of 1-(prop-2-yn-1-yl)-2-alkenylbenzenes substituted at the benzylic position with OR groups gives 1,3-disubstituted naphthalenes with concomitant fragmentation of the alkene. One of these annulations proceeds by a retro-cyclopropanation that leads to free gold(I) carbenes.