The condensation of 8-methoxy-3,4-dihydro-2H-1-benzopyran-3-amine (I) with 8-(4-bromobutyl)-8-azaspiro[4.5]decane-7,9-dione (II) by means of KI and triethylamine in ot DMF gives the secondary amine (III), which is alkylated with propyliodide and K2CO3 in hot DMF affording the tertiary amine (IV). Finally, this compound is treated with BBr3 in refluxing dichloromethane.