| 摘要 |
Phosphinoamidite carboxylates and analogs are provided that have the structure of formula (I) wherein R<1>, R<2>, R<3>, R<4>, X, Y, Z and n are as defined herein. The compounds are useful as phosphitylating agents, e.g., in the phosphitylation of 3' and 5' hydroxyl groups of nucleosides and oligonucleotides. Also provided are phosphonocarboxylate and H-phosphonite carboxylate analogs of the compounds of formula (I). The compounds enable synthesis of phosphinocarboxylate and phosphonocarboxylate oligonucleotides having reduced internucleotide charge and enhanced nuclease resistance. |
