Synthesis of Imidazo[1,2-a]pyridines by the Bis(acetyloxy)(phenyl)-λ³-iodane-Mediated Oxidative Coupling of 2-Aminopyridines with β-Keto Esters and 1,3-Diones
作者:Wei Yu、Xianpei Wang、Lijuan Ma
DOI:10.1055/s-0030-1260106
日期:2011.8
2-aminopyridines and β-keto esters by using bis(acetyloxy)(phenyl)-λ³-iodane as an oxidant and borontrifluoride etherate as a catalyst. The amount of catalyst plays a key role in determining the course of the reaction. Whereas the use of 0.2 equivalents of catalyst ensures the generation of imidazo[1,2-a]pyridines, raising the amount of catalyst to 1.0 equivalents results in exclusive α-acetoxylation of
咪唑并[1,2一]吡啶-3-羧酸盐,可直接由2-氨基吡啶和β酮酯通过使用双(乙酰基氧基)制备(苯基)-λ ³ -iodane作为氧化剂和三氟化硼醚作为催化剂。催化剂的量在确定反应过程中起关键作用。尽管使用0.2当量的催化剂可确保生成咪唑并[1,2- a ]吡啶,但将催化剂的量提高至1.0当量可导致β-酮酯的独家α-乙酰氧基化。2-氨基吡啶也可以与1,3-二酮反应,得到3-酰基咪唑并[1,2- a ]吡啶。 杂环-多环-环化-氧化-偶联
TBAI-catalyzed oxidative coupling of aminopyridines with β-keto esters and 1,3-diones—synthesis of imidazo[1,2-a]pyridines
作者:Lijuan Ma、Xianpei Wang、Wei Yu、Bing Han
DOI:10.1039/c1cc13568f
日期:——
TBAI could catalyze the direct oxidative CâN coupling of 2-aminopyridines with β-keto esters and 1,3-diones, which affords imidazo[1,2-a]pyridines as the products. The reaction was realized under metal-free conditions by using tert-butyl hydroperoxide (TBHP) as the oxidant.
A practical intramolecular C–H functionalization reaction of N-aryl enamines has been carried out with molecular iodine (I2) as the sole oxidant in the presence of copper iodide (CuI). The efficient and versatile synthetic method described here is compatible with both N-heteroaryl and N-aryl substituted enamines and produces diverse imidazo[1,2-a]pyridine and indole derivatives via I2-mediated oxidative
在碘化铜(CuI)存在下,以分子碘(I 2)为唯一氧化剂,进行了N-芳基烯胺的分子内C–H官能化反应。本文所述的高效且通用的合成方法与N-杂芳基和N-芳基取代的烯胺兼容,并通过I 2生成各种咪唑并[1,2- a ]吡啶和吲哚衍生物介导的氧化性C–N和C–C键的形成。这种无配体的C–H官能化方法也可以与粗制烯胺一起使用,这可以直接从芳胺和酮(或炔烃)直接合成产物,而无需纯化烯胺中间体。
Compounds
申请人:Alcaraz Lilian
公开号:US20090298807A1
公开(公告)日:2009-12-03
The present invention relates to spirocyclic amide derivatives of the formula I,
pharmaceutically acceptable salts thereof, a process for their preparation, pharmaceutical compositions containing them, and their use in therapy.
本发明涉及公式 I 的螺环酰胺衍生物,其药学上可接受的盐,其制备方法,含有它们的制药组合物以及它们在治疗中的应用。