(–)-Isopulegol undergoes Prins cyclization reaction in the presence of 20 wt% of acid-treated montmorillonite K10 to produce octahydro-2H-chromen-4-ols in good yields and with high cis selectivities under solvent-free conditions. The solid-acid catalyst can be reused without loss of its activity.
Key words
(–)-isopulegol - Prins cyclization - H-K10 mont - octahydro-2
H-chromen-4-ols - reusability