Regiocontrolled direct C4 and C2-methyl thiolation of indoles under rhodium-catalyzed mild conditions
作者:Saurabh Maity、Ujjwal Karmakar、Rajarshi Samanta
DOI:10.1039/c7cc07086a
日期:——
Rh(III)catalyzed general strategy was developed for the site selective remote C4 (sp2) and C2 (sp3)-methyl thiolation of indole core keeping the oxime directing group at the C3 position. The transformation was accomplished undermildconditions with wide scope and functional group tolerance. The directing group can easily be removed after operation. Methyl substitution at the C2 position of indole core
Regiocontrolled Direct C−H Arylation of Indoles at the C4 and C5 Positions
作者:Youqing Yang、Pan Gao、Yue Zhao、Zhuangzhi Shi
DOI:10.1002/anie.201612599
日期:2017.3.27
An effective and practical strategy has been established for the direct and site‐selective arylation of indoles at the C4 and C5 positions with the aid of a readily accessible, cheap, and removable pivaloyl directing group at the C3 position. This transformation shows good functional‐group tolerance and could serve as a powerful synthetic tool for the synthesis of medicinally relevant compounds. This
Copper-Catalyzed Unstrained C–C Single Bond Cleavage of Acyclic Oxime Acetates Using Air: An Internal Oxidant-Triggered Strategy toward Nitriles and Ketones
A copper-catalyzed aerobic oxidative C–C single bondcleavage of acyclic unstrained oxime acetates is reported, providing various aryl nitriles and ketones in good yields. Mechanistic studies indicate a radical procedure is involved in this transformation, and the oxygen atom in the ketone products is originated from O2 in the air. Oxime acetates as an internal oxidant have been proved to be an initiator
coordination facilitated tunable reactivity between alkenylation and alkylation of indoles at the C4 C-H site is presented using readily accessible allylic alcohols in the presence of Rh catalysis by switching the additives or directing group. Exclusive site selectivity, functional group tolerance, and late-stage modifications are the important practical features.