Yield:-

Reaction Conditions:

with sodium hydroxide;water for 2 h;Heating / reflux;

Steps:

1.a

6 ml of 2M NaOH are added to 5.260 mmol of ethyl 5,6,7,8-tetrahydroimidazo[1,5-a]pyridine-5-carboxyIate. The reaction mixture is heated at reflux for 2 hours, subsequently cooled toambient temperature and adjusted to neutral pH with 6 ml of 2M HCI. The reaction mixture isevaporated. The crude title compound is obtained from the residue as a white solid.Rt = 2.78.

References:

WO2006/5725,2006,A2 Location in patent:Page/Page column 18