title: Studies on transfer ribonucleic acids and related compounds. XLV. Block condensation of ribooligonucleotides containing 2'-O-tetrahydrofuranyl-5'-O-dimethoxytritylnucleosides.
abstract: 2'-O-Tetrahydrofuranyl-5'-O-dimethoxytrityl-N-protected nucleosides were phosphorylated to give the 3'-(o-chlorophenyl) phosphates which were then condensed with 3',5'-unprotected nucleosides to elongate the chain in the 3'-direction. The 5'-dimethoxytrityl group of these oligonucleotides was selectively deblocked by treatment with zinc bromide. The rate of removal of the dimethoxytrityl group differed in each nucleotide. A dodecamer containing a termination codon UAG, U(AGU)3AG, was synthesized by elongating the chain in the 5'-direction using the selective dedimethoxytritylation followed by condensation of protected oligonucleotide blocks.
mesh_terms: D001483:Base Sequence; D002855:Chromatography, Thin Layer; D005663:Furans; D007202:Indicators and Reagents; D009841:Oligonucleotides / Q000138:chemical synthesis*; D009843:Oligoribonucleotides / Q000138:chemical synthesis*; D012343:RNA, Transfer / Q000138:chemical synthesis*
chemical_list: D005663:Furans; D007202:Indicators and Reagents; D009841:Oligonucleotides; D009843:Oligoribonucleotides; D012343:RNA, Transfer