InBr3-catalyzed intramolecular cyclization of 2-alkynylanilines leading to polysubstituted indole and its application to one-pot synthesis of an amino acid precursor
作者:Norio Sakai、Kimiyoshi Annaka、Takeo Konakahara
DOI:10.1016/j.tetlet.2005.11.121
日期:2006.1
We describe InBr3-catalyzed cyclization of 2-alkynylaniline derivatives having a variety of functional groups producing polysubstituted indoles. This methodology could be applied to the one-pot synthesis of an amino acid precursor by the addition of a catalytic amount of the indium salt, an imine, and TMSCl.
InBr<sub>3</sub>-Promoted Divergent Approach to Polysubstituted Indoles and Quinolines from 2-Ethynylanilines: Switch from an Intramolecular Cyclization to an Intermolecular Dimerization by a Type of Terminal Substituent Group
Use of a 2-ethynylaniline having an alkyl or aryl group on the terminal alkyne selectively produced a variety of polyfunctionalized indole derivatives in moderate to excellent yields via indium-catalyzed intramolecular cyclization of the corresponding alkynylaniline. In contrast, employment of a substrate with a trimethylsilyl group or with no substituent group on the terminal triple bond, exclusively
The present invention provides a compound represented by the formula (I)
wherein X is a hydrogen atom or a fluorine atom; R is a hydrogen atom or alkyl; R
1
is (1) cyclopropyl optionally substituted by 1 to 3 halogen atoms or (2) phenyl optionally substituted by 1 to 3 halogen atoms; R
2
is alkyl, alkoxy, haloalkoxy, a halogen atom, cyano, etc.; and R
3
is 7-oxo-7,8-dihydro-1,8-naphthyridinyl, 3-pyridyl, etc., or a salt thereof. The compound of the present invention has excellent antimicrobial activity against
Clostridium difficile
and is useful for the prevention or treatment of intestinal infection such as
Clostridium difficile
-associated diarrhea.
DFT-Guided Phosphoric-Acid-Catalyzed Atroposelective Arene Functionalization of Nitrosonaphthalene
作者:Wei-Yi Ding、Peiyuan Yu、Qian-Jin An、Katherine L. Bay、Shao-Hua Xiang、Shaoyu Li、Ying Chen、K.N. Houk、Bin Tan
DOI:10.1016/j.chempr.2020.06.001
日期:2020.8
naphthalene via chiral phosphoric acid catalysis. This strategy enables efficient construction of atropisomeric indole-naphthalenes and indole-anilines with excellent stereocontrol. Density functional theory (DFT) calculations provide further insights into the origins of enantioselectivity and the reaction mechanisms. The successful application in the synthesis of NOBINs (2-amino-2′-hydroxy-1,1′-binaphthyl)
Palladium-Catalyzed C-C Ring Closure in α-Chloromethylimines: Synthesis of 1<i>H</i>
-Indoles
作者:Delia Bellezza、Bárbara Noverges、Francesco Fasano、Jeymy T. Sarmiento、Mercedes Medio-Simón、Gregorio Asensio
DOI:10.1002/ejoc.201801607
日期:2019.2.14
2‐aryl‐ and 2‐alkyl‐1H‐indoles. Readily or commercially available α‐chloromethyl‐aryl or ‐alkyl ketones are used as the precursors. Indoles containing substituents, including halogens, at the benzene ring are also easily accessible simply by use of the appropriate substituted aromatic amine.