High yield protection of purine ribonucleosides for H-phosphonate RNA synthesis
摘要:
We report a new method for protecting nucleosides for hydrogen phosphonate RNA synthesis that gives very high yields for the purines. This method is based on our finding that, for adenosine and guanosine, silylation of a mixture of 2' and 3' H-phosphonates in the presence of DBU is highly selective for the 2' hydroxyl. (C) 1997 Elsevier Science Ltd.
High yield protection of purine ribonucleosides for H-phosphonate RNA synthesis
摘要:
We report a new method for protecting nucleosides for hydrogen phosphonate RNA synthesis that gives very high yields for the purines. This method is based on our finding that, for adenosine and guanosine, silylation of a mixture of 2' and 3' H-phosphonates in the presence of DBU is highly selective for the 2' hydroxyl. (C) 1997 Elsevier Science Ltd.
2-(4-tolylsulfonyl)ethoxymethyl (TEM) as a new 2'-OH protecting group is reported for solid-supported RNAsynthesis using phosphoramidite chemistry. The usefulness of the 2'-O-TEM group is exemplified by the synthesis of 12 different oligo-RNAs of various sizes (14-38 nucleotides long). The stepwise coupling yield varied from 97-99% with an optimized coupling time of 120 s. The synthesis of all four pure phosphoramidite