High-pressure diels-alder cycloadditions between benzylideneacetones and 1,3-Butadienes: Application to the synthesis of (R,R)-(-)- and (S,S)-(+)-Δ8-tetrahydrocannabinol

Article abstract of DOI:10.1021/jo100785w

High-pressure Diels-Alder reactions of various alkoxy/alkyl-substituted benzylideneacetones with methyl-1,3-butadienes are reported. Activation by high pressure (8-11 kbar) in combination with the mild Lewis acid HfCl ₄2THF allows these reactions to efficiently and regioselectively produce a series of ortho-substituted cyclohexenyl-benzene cycloadducts, that are useful precursors for the expeditious construction of the privileged 6,6-dimethyltetrahydro-6H-benzo[c]chromene skeleton. Application to the synthesis of Δ⁸-trans-THC in both enantiomeric pure forms is based on the successful resolution of selected cycloadduct by the SAMP-hydrazone method.