Disclosed are processes for preparing compounds of the formula (I) and pharmaceutically acceptable salts or esters thereof:
1
wherein R
2
is a purine or pyrimidine base or an analogue or derivative thereof; and Z is S, S═O or SO
2
. The invention also relates to intermediates of use in the preparation of these compounds.
本发明涉及制备式(I)化合物及其药学上可接受的盐或酯的过程:其中R2是
嘌呤或
嘧啶基或其类似物或衍
生物;Z是S、S═O或SO2。本发明还涉及在制备这些化合物过程中使用的中间体。