Boronation-thallation, a new approach to the synthesis of indoles having aryl and/or a heteroaryl substituent at the 4-position.

Abstract
A new coupling reaction for unsymmetrical biaryls was developed and applied successfully to the syntheses of 4-arylindoles. Photoreaction of 4-halogenoindoles also proved to be a useful method for preparing 4-substituted indoles. An alternative method for synthesizing 4-(3-pyridyl)-3-indolecarbaldehyde is also reported

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