Patent ID: 7015337

Claim:
A process for preparing a compound of formula 7 which comprises the steps of: a) reacting a compound of formula 1 with hydroxylamine to produce a compound of formula 2, b) O-acetylating the obtained compound of formula 2 to produce prepare a compound of formula 3, c) removing an acetyl group of the compound of formula 3 and introducing a cyano group therein to prepare a compound of formula 4, d) brominating a moiety of methyl group in the obtained compound of formula 4 to prepare a compound of formula 5, e) subjecting the obtained compound of formula 5 to an azide reaction to prepare a compound of formula 6, and f) subjecting the obtained compound of formula 6 to a reaction for producing iminophosphorane and then hydrolysing the obtained reactant wherein, Ac is an acetyl group.