Nickel-Catalyzed CH Arylation of Azoles with Haloarenes: Scope, Mechanism, and Applications to the Synthesis of Bioactive Molecules
作者:Takuya Yamamoto、Kei Muto、Masato Komiyama、Jérôme Canivet、Junichiro Yamaguchi、Kenichiro Itami
DOI:10.1002/chem.201101091
日期:2011.8.29
Novel nickel‐based catalytic systems for the CH arylation of azoles with haloarenes and aryl triflates have been developed. We have established that Ni(OAc)2/bipy/LiOtBu serves as a general catalytic system for the coupling with aryl bromides and iodides as aryl electrophiles. For couplings with more challenging electrophiles, such as aryl chlorides and triflates, the Ni(OAc)2/dppf (dppf=1,1′‐bis
对于C新颖的镍基催化体系与卤代芳烃和芳基三氟甲磺酸酯唑h的芳基化得到了发展。我们已经确定,Ni(OAc)2 / bipy / LiO t Bu用作与芳基溴化物和碘化物作为芳基亲电子试剂偶联的一般催化体系。对于与更具挑战性的亲电试剂(例如芳基氯化物和三氟甲磺酸酯)偶联,发现Ni(OAc)2 / dppf(dppf = 1,1'-bis(diphenylphosphino)ferrocene)系统是有效的。噻唑,苯并噻唑,恶唑,苯并恶唑和苯并咪唑可用作杂芳烃偶联伴侣。经过进一步研究,我们发现了使用Mg(O t Bu)2进行本偶联的新方案作为LiO t Bu的温和且便宜的替代品。还描述了试图揭示这种镍催化的杂联芳基偶联机理的尝试。该新开发的方法已成功应用于非布索坦(一种有效治疗痛风和高尿酸血症的黄嘌呤氧化酶抑制剂),他法米第(一种有效治疗TTR淀粉样蛋白多神经病的药物)和texaline(一种天然的抗结核药物)的合成活动)。