Practical Synthesis of Wybutosine, the Hypermodified Nucleoside of Yeast Phenylalanine Transfer Ribonucleic Acid.
作者:Taisuke Itaya、Tae Kanai、Takehiko Iida
DOI:10.1248/cpb.50.530
日期:——
deprotection. On the other hand, the minor nucleoside wybutosine of yeast tRNA(Phe) was isolated on a scale of 80 microg by partial digestion of unfractionated tRNA (1 g) with nuclease P1, followed successively by reversed-phase column chromatography, complete digestion with nuclease P1/alkaline phosphatase, and reversed-phase HPLC. Comparison of this nucleoside with 2 has unambiguously established that
Synthesis of [R-(R,S)]- and [S-(R,R)]β-, the most probable alternatives for the hypermodified nucleoside of rat liver phenylalanine transfer ribonucleic acid
作者:Taisuke Itaya、Tae Kanai、Takehiko Iida
DOI:10.1016/s0040-4039(97)00253-0
日期:1997.3
The synthesis of the title compounds started with the Vilsmeier reaction of (5b) and proceeded through the Wittig reaction with (R)-N-(methoxycarbonyl)-3-(triphenylphosphonio)alaninate (4), methylation with trimethylsilyldiazomethane, OsO4 oxidation, cyclocondensation with triphosgene, and catalytic hydrogenolysis. Chromatographic separation of the resulting diastereomeric mixture and subsequent deprotection