A process for the preparation of a 4’-azido-2’,3’,5’-triacyl-nucleoside compound (I;B=B1; R1 is R1aCO-and R2 is R2aCO-) or a 4’-azidonucleoside compounds (I; B is B1 or B2 and R1 and R2 are hydrogen and acid addition salts thereof) wherein R1a and R2a are independently C1-10 alkyl or phenyl optionally substituted with 1 to 3 substituents selected from the group consisting of alkyl, alkoxy, halogen, nitro or cyano and R3 is selected from the group consisting of hydrogen, C1-6 alkyl, C1-3 haloalkyl and halogen, comprising contacting a 5’-iodo compound II with a peracid, R2aC(O)OOH, an acid R2aC(O)OH and a phase transfer catalyst and interconverting a uridine B1 to a cytosine B2. The present process provides the 4’-azidonucleosides safely and selectively in high purity with increased efficiency.
一种制备4'-偶
氮-2',3',5'-三酰基-核苷化合物(I;B=B1;R1为R1aCO-,R2为R2aCO-)或4'-偶
氮核苷化合物(I;B为B1或B2,R1和R2为
氢及其酸盐)的方法,其中R1a和R2a独立地为C1-10烷基或
苯基,可选地取代为1至3个来自烷基、烷
氧基、卤素、硝基或
氰基的取代基,R3选自
氢、C1-6烷基、C1-3卤代烷基和卤素组成,包括将5'-
碘化合物II与过
氧酸、R2aC(O)OOH、酸R2aC(O)OH和相转移
催化剂接触,将
尿苷B1互变为
胞嘧啶B2。该过程以提高效率安全、选择性地提供高纯度的4'-偶
氮核苷化合物。