The present invention relates to a method of preparing an organic biologically active compound of formula (I), wherein R1, R2, R3, R4,. X1, X2 and X3 are as defined in the specification, to certain novel intermediates obtainable from such a method and their use.
本发明涉及一种制备有机
生物活性化合物(I)的方法,其中R1、R2、R3、R4、X1、X2和X3如规范中所定义,以及从该方法中获得的某些新型中间体及其用途。