Expanding the Genetic Alphabet: Non-Epimerizing Nucleoside with the pyDDA Hydrogen-Bonding Pattern
摘要:
6-Amino-3-(2'-deoxy-beta-D-ribofuranosyl)-5-nitro-1H-pyridin-2-one (4), a C-glycoside exhibiting the nonstandard pgammaDDA hydrogen-bonding pattern, was synthesized via Heck coupling. The nitro group greatly enhances the stability of the nucleoside toward acid-catalyzed epimerization without leading to significant deprotonation of the heterocycle at physiological pH. These results make nucleoside 4 a promising candidate for an expanded genetic alphabet.
A Common, Facile and Eco-Friendly Method for the Reduction of Nitroarenes, Selective Reduction of Poly-Nitroarenes and Deoxygenation of <i>N</i>
-Oxide Containing Heteroarenes Using Elemental Sulfur
作者:Angel H. Romero、Hugo Cerecetto
DOI:10.1002/ejoc.202000064
日期:2020.3.31
A facile and convenient protocol for the reduction of nitro‐arenes and deoxygenation of heteroarenes N‐oxides under transition metal and additive free conditions has been developed. The strategy allows the selective reduction of poly‐nitroarenes as well as the efficient deoxygetaion of a variety of N‐oxides containing heteroarenes including benzofuroxanes and phenzines with a broad substrate scope