Patent ID: 6977298

Claim:
A method of preparing a compound of formula I wherein R 1 is hydrogen or halogen; R 2 is hydrogen or methyl; R 3 is: optionally substituted aryl, alkyl, alkenyl, alkynyl, cycloalkyl, heterocycloalkyl, heteroaryl; or —C(O)OR 7 , wherein R 7 is optionally substituted alkyl; n is 1 or 2; the method comprising: a) converting a compound of formula II, wherein R 4 is —(CH 2 ) n NH 2 ; R 5 is —CO 2 CH 3 into a compound of formula III b) converting the compound of formula III into a compound of formula IV, wherein X is bromine or iodine; and c) transforming the compound of formula IV into the compound of formula I.