General and Modular Synthesis of Isomeric 5-Substituted Pyridin-2-yl and 6-Substituted Pyridin-3-yl C-Ribonucleosides Bearing Diverse Alkyl, Aryl, Hetaryl, Amino, Carbamoyl, and Hydroxy Groups

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388963%3A_____%2F11%3A00364189" target="_blank" >RIV/61388963:_____/11:00364189 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1021/jo200949c" target="_blank" >http://dx.doi.org/10.1021/jo200949c</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/jo200949c" target="_blank" >10.1021/jo200949c</a>

Jazyk výsledku

angličtina

Název v původním jazyce

General and Modular Synthesis of Isomeric 5-Substituted Pyridin-2-yl and 6-Substituted Pyridin-3-yl C-Ribonucleosides Bearing Diverse Alkyl, Aryl, Hetaryl, Amino, Carbamoyl, and Hydroxy Groups

Popis výsledku v původním jazyce

A general modular and practical methodology for preparation of diverse 5-substituted pyridin-2-yl and 6-substituted pyridin-3-yl C-ribonucleosides was developed. Regioselective lithiation of 2,5-dibromopyridine proceeded at the position 5- or 2- depending on the solvent and the resulting bromopyridyl lithium species underwent additions to protected ribonolactone and further transformations to hemiketals that were diastereoselectively reduced to give either 5-bromopyridine-2-yl or 6-bromopyridine-3-yl silyl-protected C-ribonucleosides. These intermediates were then subjected to a series of cross-coupling reactions, aminations, aminocarbonylations and hydroxylations to give a series of protected 1beta-(5-alkyl-, 5-aryl-, 5-amino- 5-carbamoyl and 5-hydroxypyridin-2-yl)-C-ribonucleosides and beta-(6-alkyl-, 6-aryl-, 6-amino- 6-carbamoyl and 6-hydroxypyridin-3-yl)-C-ribonucleosides. Deprotection of silylated nucleosides by Et3N.3HF, TBAF or TFA gave a series of free C-nucleosides.

Název v anglickém jazyce

General and Modular Synthesis of Isomeric 5-Substituted Pyridin-2-yl and 6-Substituted Pyridin-3-yl C-Ribonucleosides Bearing Diverse Alkyl, Aryl, Hetaryl, Amino, Carbamoyl, and Hydroxy Groups

Popis výsledku anglicky

A general modular and practical methodology for preparation of diverse 5-substituted pyridin-2-yl and 6-substituted pyridin-3-yl C-ribonucleosides was developed. Regioselective lithiation of 2,5-dibromopyridine proceeded at the position 5- or 2- depending on the solvent and the resulting bromopyridyl lithium species underwent additions to protected ribonolactone and further transformations to hemiketals that were diastereoselectively reduced to give either 5-bromopyridine-2-yl or 6-bromopyridine-3-yl silyl-protected C-ribonucleosides. These intermediates were then subjected to a series of cross-coupling reactions, aminations, aminocarbonylations and hydroxylations to give a series of protected 1beta-(5-alkyl-, 5-aryl-, 5-amino- 5-carbamoyl and 5-hydroxypyridin-2-yl)-C-ribonucleosides and beta-(6-alkyl-, 6-aryl-, 6-amino- 6-carbamoyl and 6-hydroxypyridin-3-yl)-C-ribonucleosides. Deprotection of silylated nucleosides by Et3N.3HF, TBAF or TFA gave a series of free C-nucleosides.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CC - Organická chemie

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2011

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Organic Chemistry

ISSN

0022-3263

e-ISSN

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Svazek periodika

76

Číslo periodika v rámci svazku

16

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

17

Strana od-do

6619-6635

Kód UT WoS článku

000293759000016

EID výsledku v databázi Scopus

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