DDQ/FeCl3-mediated tandem oxidative carbon-carbon bond formation for the Synthesis of indole-fluorene hybrid molecules

Org Biomol Chem. 2021 Jan 28;19(4):906-910. doi: 10.1039/d0ob00413h. Epub 2021 Jan 7.

Abstract

A series of diverse and complex hybrid structures of indole bearing fluorene were obtained in the presence of DDQ with high regioselectivity under mild conditions from biaryl tethered 3-(methylene)indoline in good to excellent yields. The strategy involves tandem allylic Csp3-H oxidation and subsequent intramolecular carbon-carbon bond formation. The yield of the product was dramatically improved in the presence of additives such as FeCl3 and molecular sieves (4 Å). A possible mechanism is proposed for this tandem process.

Publication types

  • Research Support, Non-U.S. Gov't