Synthesis of Novel 3‘-<i>C</i>-Methylene Thymidine and 5-Methyluridine/Cytidine H-Phosphonates and Phosphonamidites for New Backbone Modification of Oligonucleotides
作者:Haoyun An、Tingmin Wang、Martin A. Maier、Muthiah Manoharan、Bruce S. Ross、P. Dan Cook
DOI:10.1021/jo001699u
日期:2001.4.1
ne)-protected H-phosphonate monomer 7. 5'-O-MMT-protected 3'-C-methylene-modified H-phosphonates 5, 3, and 7 were converted to the corresponding cyanoethyl H-phosphonates 50, 51, and 56 using DCC as a coupling reagent. One-pot three-step reactions of 50, 51, and 56 provided the desired 3'-C-methylene-modified phosphonamidite monomers 8-10. Some of these new3'-methylene-modified monomers 1-10 have