Environment-friendly and efficient synthesis of 2-aminobenzo-xazoles and 2-aminobenzothiazoles catalyzed by <i>Vitreoscilla</i> hemoglobin incorporating a cobalt porphyrin cofactor
作者:Yaning Xu、Fengxi Li、Nan Zhao、Jiali Su、Chunyu Wang、Ciduo Wang、Zhengqiang Li、Lei Wang
DOI:10.1039/d1gc02533c
日期:——
In this study, an environment-friendly and efficient artificial Vitreoscilla hemoglobin (VHb) for the synthesis of 2-aminobenzoxazoles and 2-aminobenzothiazoles has been reported. We demonstrate an expression-based porphyrinsubstitution strategy to produce VHb containing cobalt porphyrin instead of native hemin, which can catalyze the oxidative cyclization of corresponding 2-aminobenzoxazoles and
A General Catalyst for Buchwald-Hartwig Amination to Prepare Secondary Five-Membered Heteroaryl Amines with Breaking the Base Barrier
作者:Fabin Zhou、Lixue Zhang、Wenbo Hu、Bingxin Yuan、Ji-cheng Shi
DOI:10.1016/j.jcat.2023.02.018
日期:2023.3
sometimes needing strongbases, perplexes the application of the palladium-catalyzed CN cross-coupling reactions. The terphenyl phosphine TXPhos supporting palladium catalyst [(TXPhos)(allyl)PdCl] dramatically broadened the existing scope of five-membered heteroaryl substrates and made the weak bases KHCO3 and KOAc become general and optimal choices. Therefore, the barrier of bases has been broken and
底物的范围限制,特别是五元杂芳基底物通常出现在医学和生物活性分子中,以及高钯负载量和有时需要强碱,困扰着钯催化的 C N 交叉偶联反应的应用。三联苯基膦TXPhos负载钯催化剂[(TXPhos)(allyl)PdCl]大大拓宽了五元杂芳基底物的现有范围,使弱碱KHCO 3 和KOAc成为通用和优化的选择。因此,碱基屏障已被打破,并建立了通过钯催化的 C N 交叉偶联反应制备仲五元杂芳基胺的有吸引力的方案。