Synthesis of Fluorinated Octahydro-2H-Chromenes in the Presence of the BF3·Et2O–H2O Catalytic System

The synthesis of fluorinated octahydro-2H-chromene was carried out using the Prins reaction between the monoterpenoid (–)-isopulegol and carbonyl compounds in the presence of the BF3·Et2O–H2O system, which acts as both an acid catalyst and a fluorine source. The use of the readily available and easy-to-use BF3·Et2O reagent makes this method of obtaining fluorine derivatives simple and practical.