Novel nickel‐based catalytic systems for the CHarylation 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)。
Room temperature HFIP/Ag-promoted palladium-catalyzed C–H functionalization of benzothiazole with iodoarenes
作者:Santosh Kori、Yuvraj Bhujbal、Kamlesh Vadagaonkar、Anant R. Kapdi、Saidurga Prasad Kommyreddy、Santosh J. Gharpure
DOI:10.1039/d1cc06063e
日期:——
A versatile synthetic protocol involving the room temperature direct arylation of benzothiazole with a wide variety of iodoarenes under Ag-promoted Pd-catalyzed conditions in HFIP as the reaction solvent has been presented.
An Iron and Copper System Catalyzed C–H Arylation of Azoles with Arylboronic Acids
作者:Song-Lin Zhang、Wei-Ye Hu、Pei-Pei Wang
DOI:10.1055/s-0034-1379073
日期:——
An efficient, environmentally friendly, and economical new method for arylation reactions of azoles with arylboronic acids via copper-iron-catalyzed C-H and C-B bond activation has been developed. The protocol tolerates a series of functional groups, such as methoxy, nitro, cyano, chloro, and trifluoromethyl groups.
Visible light initiated amino group <i>ortho</i>-directed copper(<scp>i</scp>)-catalysed aerobic oxidative C(sp)–S coupling reaction: synthesis of substituted 2-phenylbenzothiazoles <i>via</i> thia-Wolff rearrangement
作者:Mandapati Bhargava Reddy、Ramasamy Anandhan
DOI:10.1039/d0cc00815j
日期:——
A facile amino group ortho-directed visible-light-driven copper-catalysed aerobic oxidative C(sp)-S coupling reaction of a dimer of 2-aminothiophenol with terminal alkynes was achieved. This photochemical reaction shows an excellent conversion and chemoselectivity towards the formation of C(sp)-S coupling and has been employed for a wide range of thiol dimers, and alkynes. Furthermore, the synthetic