Efficient Synthesis and First Regioselective C-3 Direct Arylation of Imidazo[1,2-<i>b</i>]pyrazoles
作者:Sandrine Grosse、Christelle Pillard、Stéphane Massip、Jean Michel Léger、Christian Jarry、Stéphane Bourg、Philippe Bernard、Gérald Guillaumet
DOI:10.1002/chem.201202593
日期:2012.11.19
Highly regioselective: An efficient synthesis of the imidazo[1,2‐b]pyrazole core has been developed, and the first regioselective palladium‐catalyzed direct arylation of the C‐3 position is described (see scheme). Good to excellent yields were obtained for a wide range of aryl partners with electron‐rich and electron‐poor substituents. This methodology allows rapid access to a large variety of imidazo[1
区域选择性高:已开发了咪唑并[1,2- b ]吡唑核的有效合成方法,并描述了第一个区域选择性钯催化的C-3位置的直接芳基化反应(参见方案)。对于具有富电子和贫电子取代基的各种芳基配偶,均获得了良好或优异的收率。这种方法可以快速获得各种咪唑并[1,2- b ]吡唑产品,并为新的生物活性化合物的设计开辟了道路。