Patent ID: 7102001

Claim:
A process for preparing compound (I) of the formula wherein R is aryl, optionally substituted with alkyl or halogen or heterocyclyl; R 1 is alkyl; R 2 is heterocyclyl, optionally substituted with a BOC protecting group; or a pharmaceutically acceptable salt or stereoisomer thereof, which comprises the steps of reacting Compound II of the formula or a tautomer thereof with an activating agent to afford Compound III of the formula, where X is a leaving group, R 1 is as defined above, and R 3 is lower alkyl which is subsequently coupled with Compound IV of the formula where R is as defined above, to afford Compound V of the formula which is hydrolyzed to afford Compound VI of the formula which subsequently undergoes a Curtius rearrangement in the presence of a compound of the formula —R 2 CH 2 OH to afford Compound I.