Mn‐Catalyzed Dehydrocyanative Transannulation of Heteroarenes and Propargyl Carbonates through C−H Activation: Beyond the Permanent Directing Effects of Pyridines/Pyrimidines
作者:Guangfan Zheng、Jiaqiong Sun、Youwei Xu、Shuailei Zhai、Xingwei Li
DOI:10.1002/anie.201900166
日期:2019.4
Pyridines/pyrimidines are common and effective directing groups in C−Hactivation. However, they are poorly functionalizable heteroarenes. Reported in this work is Mn‐catalyzeddehydrocyanativetransannulation between three classes of heteroarenes and propargylcarbonates. The pyridyl/pyrimidyl groups in the heteroarenes initially function as directing groups to enable C−H allenylation; they then undergo
Manganese(I)-Catalyzed Synthesis of Fused Eight- and Four-Membered Carbocycles via C–H Activation and Pericyclic Reactions
作者:Youwei Xu、Guangfan Zheng、Lingheng Kong、Xingwei Li
DOI:10.1021/acs.orglett.9b01139
日期:2019.5.3
facile construction of complex cycles. On the other hand, metal-catalyzed C–Hactivation has been established as an important strategy for rapid synthesis of complex structures. The two areas are integrated in Mn(I)-catalyzed redox-neutral coupling of 3-alkenyl- and 3-allylindoles with propargylic carbonates, which occurred via C–H allenylation with subsequent pericyclic reactions to afford fused eight-
Ortho C-H allenylation of electron-rich benzene derivatives with propargylic alcohol derivatives has been a challenge, due to their great innate tendency toward a para C-H allenylation via an SN2'-type substitution process. Here, we described a Ru(II)-catalyzed regioselective ortho C-H allenylation of electron-rich aniline and phenol derivatives, which allows the previously challenging synthesis of a