The present invention relates to nucleoside derivatives for the treatment of Hepatitis C viral infections including compounds of formula I (I), to pharmaceutical compositions comprising these compounds and methods for treatment or prophylaxis of Hepatitis C Virus mediated diseases employing said compounds in monotherapy or in combination therapy. The present invention further provides a process for preparing 1',3',4'-triacyl pyrimidine nucleoside from a N,1',3',4'-tetraacylpyrimidine nucleoside.
[EN] PROCESSES FOR PREPARING 4'AZIDO NUCLEOSIDE DERIVATIVES<br/>[FR] METHODES DE PREPARATION DE DERIVES DE 4'AZIDO NUCLEOSIDE
申请人:HOFFMANN LA ROCHE
公开号:WO2005000864A1
公开(公告)日:2005-01-06
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.