Manipulation of Water for Diversified Functionalization of Tetrahydro-β-carbolines (THβCs) with Indoles
作者:Dekang Xu、Fu Ye、Jinxiang Ye、Yu Gao、Haijun Chen
DOI:10.1021/acs.orglett.9b02413
日期:2019.8.2
temperature that exhibit a broad functional-group tolerance. More water leads to monoarylation, while less water leads to diarylation. Further one-step transformation afforded oxidized bis(indolyl)methanes, eudistomin U, and the related derivatives in satisfactory yields.
Oxidative rearrangement of indoles is an important transformation to yield 2-oxindoles and spirooxindoles, which are present in many pharmaceutical agents and bioactive natural products. Previous oxidation methods show either broad applicability or greenness but rarely achieve both. Reported is the discovery of Fenton chemistry-enabled green catalytic oxidative rearrangement of indoles, which has wide substrate
2,3-Disubstituted indoles from olefins and hydrazinesvia tandem hydroformylation–Fischer indole synthesis and skeletal rearrangement
作者:Petra Linnepe (née Köhling)、Axel M. Schmidt、Peter Eilbracht
DOI:10.1039/b513364e
日期:——
synthesis of 2,3-disubstituted indoles. After hydroformylation of selected olefins to form alpha-branched aldehydes in a one-pot procedure these are condensed with phenylhydrazine to give hydrazones. Upon acid-promoted [3,3]-sigmatropic rearrangement indolenine intermediates with quaternary centres in the 3-position are formed, which, after selective Wagner-Meerwein-type rearrangement of one of the
Herein, we report a biomimeticoxidativecoupling cyclization strategy for the highly efficient functionalization of tetrahydrocarbolines (THCs). This process enables rapid access to complex isochromanoindolenine scaffolds in moderate to excellent yields. The reaction proceeds smoothly and rapidly (complete within minutes) in an open flask. This operationally simple protocol is scalable and compatible