Patent ID: 9206116
Filing Date: 2015-12-08
Classification: A61P,C07C,C07D,C07F,Y02P

Abstract:
1. A process for producing a compound according to formula (18) or a salt thereof comprising the steps a) providing a compound according to formula (1), or tautomer, or salt thereof, b) methylating the compound according to formula (1), or tautomer, or salt thereof, to obtain a compound according to formula (2), or tautomer, or salt thereof, c) reacting the compound according to formula (2), or tautomer, or salt thereof, with a ring opening agent to obtain a compound according to formula (3) or a salt thereof d) reacting a compound according to formula (3) or a salt thereof to obtain a compound according to formula (18) or a salt thereof, wherein in the above formulae R1 and R2 are independently, of each other, hydrogen or a nitrogen protecting group and R3 is hydrogen or alkyl.