Scheme 23.
Reaction between 2,5-dihydroxy-3-undecylcyclohexa-2,5-diene-1,4-dione (145) and unsaturated aldehydes to obtain cannabinoid–quinone analogs. (a) depicts the reaction mechanism, Condensation reaction depicts in blue the bond created, with the green circle depicting the cyclization proceeding, while the brown circle depicts the inability for the cyclization to occur. (b) depicts the transformation of CBD-quinone to various analogs.