Patent ID: 9278972
Filing Date: 2016-03-08
CPC Classification: C07B,C07C,C07D

Claim Text:
1. A process for the preparation of a compound of formula XI or a salt thereof comprising the steps of: (i) contacting a compound of formula VI or a salt thereof (ii) optionally, if a compound of formula VIII′ is obtained, reducing the compound of formula VIII′ to a compound of formula VIII, (iii) converting a compound of formula VIII by nitrosation to a compound of formula IX or a compound of formula IX′  and (iv) coupling the compound of formula IX or IX′ with a compound of formula X (0-1) providing a compound of formula III or a salt thereof (0-2) directly converting a compound of formula III to a compound of formula VI, and (0-3) optionally converting a compound of formula VI to a salt thereof; or (0-1′) providing a compound of formula III or a salt thereof (0-2′) converting a compound of formula III to a compound of formula IV (0-3′) converting a compound of formula IV to a compound of formula VI, (0-4′) optionally converting a compound of formula VI to a salt thereof; or (0-1″) providing a compound of formula III or a salt thereof (0-2″) converting a compound of formula III to a compound of formula V (0-3″) converting a compound of formula V to a compound of formula VI, (0-4″) optionally converting a compound of formula VI to a salt thereof; or (0-1″) providing a compound of formula J (0-2′″) reacting the compound of formula J with the compound of formula Z (0-3′″) oxidising the compound of formula K to obtain a compound of formula L (0-4′″) converting the compound of formula L to the compound of formula VI, and (0-5′″) optionally converting a compound of formula VI to a salt thereof.