abstract |
The present invention relates to a novel process for preparing intermediate compound of formula (2) which can be usefully used to prepare compound of formula (I) which exhibits good inhibitory activity against dipeptidyl peptidase IV enzyme. Wherein R1, R2, R3, R4, R5 and R6 are as defined in the specification. Wherein R 3, R 4, R 5, R 6 and P 1 are as defined in the specification. |