Patent ID: 6939988

Claim:
A compound of formula (If) where Ar represents a divalent single or fused aromatic group, R 5 represents hydrogen, hydroxy, alkoxy, halogen or lower alkyl, or optionally substituted aralkyl group or forms a bond together with the adjacent group R 6 ; R 6 represents hydrogen, hydroxy, alkoxy, halogen or lower alkyl group, optionally substituted aralkyl or R 6 forms a bond together with R 5 ; R 7 represents hydrogen or an optionally substituted group selected from alkyl, cycloalkyl, aryl, aralkyl, alkoxyalkyl, alkoxycarbonyl, aryloxycarbonyl, alkylaminocarbonyl, arylaminocarbonyl, acyl, heterocyclyl, or heteroaralkyl groups; R 8 represents hydrogen or an optionally substituted group selected from alkyl, cycloxlkyl, aryl, aralkyl, heterocyclyl, or heteroaralkyl groups; n is an integer ranging from 1-4 and m is 1 and L 1 is a leaving group; and stereoisomers and salts thereof.