The efficient microwave-assisted synthesis of 5′- O-trityl inosinederivatives is described. The reported protocol allows the protection of inosinederivatives in significantly higher yields and shorter reaction times than the standard thermal conditions. This procedure is particularly suitable for modified inosines where the 5′-OH is sterically hindered (i.e. 8-bromoinosine).
On the basis of our previous findings that 5'-O-tritylinosine (KIN59) behaves as an allosteric inhibitor of the angiogenic enzyme thymidine phosphorylase (TPase), we have undertaken the synthesis and enzymatic evaluation of a novel series of nucleoside analogues modified at positions 1, 2, or 6 of the purine ring and at the 5'-position of the ribose moiety of the lead compound KIN59. SAR studies indicate