A previously elusive RuII‐catalyzed N−N bond‐based traceless C−H functionalization strategy is reported. An N‐amino (i.e., hydrazine) group is used for the directed C−H functionalization with either an alkyne or an alkene, affording an indole derivative or olefination product. The synthesis features a broad substrate scope, superior atom and step economy, as well as mild reaction conditions.
Rhodium-Catalyzed Annulation of Tertiary Aniline <i>N</i>-Oxides to <i>N</i>-Alkylindoles: Regioselective C–H Activation, Oxygen-Atom Transfer, and <i>N</i>-Dealkylative Cyclization
作者:Bin Li、Hong Xu、Huanan Wang、Baiquan Wang
DOI:10.1021/acscatal.6b00311
日期:2016.6.3
[Cp*RhIII]-catalyzed annulation of tertiary aniline N-oxides with alkynes was reported to achieve the challenging ortho C–Hfunctionalization of tertiary anilines via N–O bond acting as a traceless directing group. More significantly, this system represents the first example which integrates C–H activation, oxygen-atom transfer, and N-dealkylative cyclization in one reaction. This unprecedented coupling
据报道,[Cp * Rh III ]催化炔烃与叔胺N-氧化物的环化反应是通过N-O键作为无痕导向基团实现的,具有挑战性的叔苯胺邻位C-H功能化。更重要的是,该系统代表了第一个示例,该示例在一个反应中集成了C–H活化,氧原子转移和N-脱烷基环化。这种空前的偶联反应使N-烷基吲哚衍生物的构建具有高效率,宽泛的底物范围和良好的官能团耐受性。
Co(III)-Catalyzed, Internal and Terminal Alkyne-Compatible Synthesis of Indoles
Co(III)-catalyzed, internal and terminal alkyne-compatible indole synthesis protocol is reported herein. The N-amino (hydrazine) group imparts distinct, diverse reactivity patterns for directed C–H functionalization/cyclization reactions. Notable synthetic features include regioselectivity for a meta-substituted arylhydrazine, regioselectivity for a chain-branched terminalalkyne, formal incorporation of
Novel Synthesis of 2-Aryl and 2,3-Disubstituted Indoles by Modified Double Elimination Protocol
作者:Govindarajulu Babu、Akihiro Orita、Junzo Otera
DOI:10.1021/ol051826e
日期:2005.10.1
[reaction: see text] Syntheses of 2-aryl and 2,3-substituted indoles were realized by modified doubleelimination protocol. Under basic conditions, vinyl sulfones derived from the reaction of 2-aminobenzyl sulfone with benzaldehydes underwent cyclization and alkylation followed by elimination of sulfinic acid to afford 2,3-substituted indoles.