L1???(CH2)n???(O)mAr???CHO (Ij) where where L1 represent a leaving group such as Cl, Br, I, methanesulfonate, trifluoromethanesulfonate, p-toluenesulfonate and the like and all other symbols are as defined earlier, with a compound of formula (IIIb). where all symbols are as defined earlier, to yield a compound of formula (IIIf) which is further reduced to yield a compound of formula (If).