Interaction of (13S)-6-oxolabd-7,14-dien-13-ol with phenols on the clay askanite-bentonite

Article abstract of DOI:10.1007/BF02319283

The alkylation of some phenols with an allyl 6-oxolabdane alcohol in the presence of the clay askanite-bentonite has been investigated. It has been shown that during the reaction intermediate ortho-adducts of substitution in the aromatic nucleus are cyclized into chroman derivatives containing a bicyclic terpene residue - 2-methyl-2-(6'-oxo-Δ^7'-tetranorlabd-12'-yl)chromans. Performing the reaction in the presence of heterogeneous catalysts imposes limitations on the yields of certain products.