Manganese catalyzed C–H functionalization of indoles with alkynes to synthesize bis/trisubstituted indolylalkenes and carbazoles: the acid is the key to control selectivity
作者:Lijun Shi、Xiang Zhong、Houde She、Ziqiang Lei、Fuwei Li
DOI:10.1039/c5cc00249d
日期:——
The Mn-catalyzed C–H alkenylations of indole with terminal- and/or internal-alkynes have been developed to selectively yield indolylalkene and carbazole.
锰催化的C-H烯基化反应可以选择性地将吲哚与末端和/或内部炔烃反应,生成吲哚烯和咔唑。
Ruthenium(II)-Catalyzed Direct Addition of Indole/Pyrrole C2–H Bonds to Alkynes
A ruthenium-catalyzed C2-hydroindolation of alkynes has been achieved. This protocol provides a rapid and concise access to kinds of 2-alkenyl-substituted N-(2-pyridyl)-indoles in which the pyridyl moiety can be easily removed to afford free (N H) indoles under mild conditions. Various arenes and alkynes, including electron-deficient and electronrich internal alkynes and terminal alkynes, allow for this transformation.
Isolation of Cp*Co<sup>III</sup>
-Alkenyl Intermediate in Efficient Cobalt-Catalyzed C−H Alkenylation with Alkynes
作者:Malay Sen、Nimmakuri Rajesh、Balakumar Emayavaramban、J. Richard Premkumar、Basker Sundararaju
DOI:10.1002/chem.201705183
日期:2018.1.9
A general and efficient procedure for C−H alkenylation of arenes with a broad substrate scope catalyzed by Cp*CoIII was demonstrated with alkynes. A highly selective mono‐alkenylation and sequential bis‐C−H bond functionalization was displayed to exemplify the versatility of the cobalt catalyst. Isolation of cationic Cp*CoIII–alkenyl intermediate was achieved under identical catalytic conditions to
用炔烃证明了由Cp * Co III催化的具有广泛底物范围的芳烃的CH链烯基化的通用有效方法。高选择性的单烯基化和顺序的双CH键功能化显示了钴催化剂的多功能性。在相同的催化条件下实现了阳离子Cp * Co III-烯基中间体的分离,以进一步建立拟议的途径。
Mild and Efficient C2-Alkenylation of Indoles with Alkynes Catalyzed by a Cobalt Complex
作者:Zhenhua Ding、Naohiko Yoshikai
DOI:10.1002/anie.201200019
日期:2012.5.7
Direct alkenylation of the C2‐position of indoles bearing an easily removable N‐pyrimidyl group with alkynes has been achieved by using a cobalt catalyst complexed with a phosphine–pyridine bidentate ligand. This reaction has wide substrate scope and is highly efficient and stereoselective at room temperature. The alkenylated indoles serve as useful platforms for further synthetic transformations (some