Patent ID: 7119180

Claim:
A process for the preparation of a compound of formula (I): wherein: A is nitrogen or N→O; Hal is halogen; R 1 and R 2 are the same or different and are independently chosen from hydrogen or C 1 –C 18 alkyl; R is —(CH 2 ) m OB; wherein m is an integer from 1 to 8; and B is hydrogen, —COAr or —(CH 2 ) n —Ar; wherein n is an integer from 1 to 8; and Ar is a mono- or polycyclic aryl or heteroaryl; Z is hydrogen or C 1 –C 18 -acyl; said process comprising: reacting a compound of formula (IIIA) wherein: A, R, R 1 and R 2 are as defined above; and M is a hydroxyl protecting group; with a suitable halogenating agent to obtain a compound of the formula IB: reacting the compound of formula (IB) with a suitable deprotecting agent to obtain the compound of formula (I) wherein Z is hydrogen.