Abstract Protocols for the synthesis of C 7-nitropurine nucleosides and nucleotides are described. Each of these nucleotides can completely replace its naturally occurring counterpart in polymerase chain reaction (PCR), generating amplified duplex DNA containing nitropurines. As predicted, the electron-withdrawing power of the nitro group rendered these modified oligonucleotides susceptible to chemoselective cleavage at the ...
![N-(4-chloro-7H-pyrrolo[2,3-d]pyrimidin-2-yl)-2-methylpropanamide Structure](https://image.chemsrc.com/caspic/150/866331-10-4.png)
![4-methoxy-5-nitro-7H-pyrrolo[2,3-d]pyrimidin-2-amine Structure](https://image.chemsrc.com/caspic/074/866331-12-6.png)