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Synthesis of Polysubstituted Isoquinolines and Related Fused Pyridines from Alkenyl Boronic Esters via a Copper-Catalyzed Azidation/Aza-Wittig Condensation Sequence

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posted on 2017-12-18, 00:00 authored by Vankudoth Jayaram, Tailor Sridhar, Gangavaram V. M. Sharma, Fabienne Berrée, Bertrand Carboni
An efficient and straightforward synthesis of isoquinolines is reported from internal alkenyl boronic esters, easily prepared from the corresponding 1,2-bis­(boronates), via a sequential copper-catalyzed azidation/aza-Wittig condensation. This synthetic method has been used to synthesize quinisocaine, a topical anesthetic used for the treatment of pain and pruritus, and further extended to thieno­[2,3-c]­pyridines by using 2-thiophenecarboxaldehyde as coupling partner in the first step.

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