| abstract |
A compound of formula (I), wherein R 1 is hydrogen or a hydroxyl protecting group; and R 2 and R 3 are same or different and are independently selected from halogen or -O - S0 2 - X; wherein X is - C 1 -C 4 alkyl; C 1 - C 4 alkyl substituted with one or more halogen; or substituted or unsubstituted phenyl wherein said phenyl substituent is selected from halogen, nitro and C 1 - C 4 alkyl; provided that when R 3 is bromine, X is not p-toluyl; and a process for the preparation thereof. |