abstract |
This application involves 4 amino, 5 biphenyl, 4 base, 2 methylol, 2 methylvaleric acid compounds and preparation method thereof.The present invention, which provides to prepare, can be used for preparing formula (IV) compound or the method for the intermediary of its tautomer or salt: Wherein R 1 To R 5 , a, b, X and P 2 As defined in the description. |