Continuous-Flow Synthesis of Δ9-Tetrahydrocannabinol and Δ8-Tetrahydrocannabinol from Cannabidiol. 2023

Benedetta Bassetti, and Christopher A Hone, and C Oliver Kappe
Institute of Chemistry, University of Graz, Heinrichstraße 28, A-8010 Graz, Austria.

A challenging step in the preparation of tetrahydrocannabinol analogs is an acid-catalyzed intramolecular cyclization of the cannabidiol precursor. This step typically affords a mixture of products, which requires extensive purification to obtain any pure products. We report the development of two continuous-flow protocols for the preparation of (-)-trans-Δ9-tetrahydrocannabinol and (-)-trans-Δ8-tetrahydrocannabinol.

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