Vliv substituentu na exo stereoselektivitu u 1,3 dipolárních cykloadičních reakcích tulipalinu A s nitryl ylidy

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F08%3A00005590" target="_blank" >RIV/61989592:15310/08:00005590 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216224:14310/08:00033644

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Substituent Effect on exo Stereoselectivity in the 1,3 Dipolar Cycloaddition Reaction of Tulipalin A with Nitrile Ylides

Popis výsledku v původním jazyce

1,3-Dipolar cycloaddition reactions of dihydro-3-methylene-2(3H)-furanone (tulipalin A) with various benzonitrile(p-X-benzylide) ylides prefer formation of exo-cycloadducts in the extent corresponding to an increasing electron donor character of the substituent X in the para-position of the benzylide phenyl ring of the 1,3-dipolar reagent. The substituent effect on diastereoselectivity of the 1,3-DC reaction is rationalized in terms of CH/pi interaction between the dipole and the dipolarophile in an exo-transition state. The determining role of such an interaction is demonstrated by the correlation of the observed diastereoselectivities with substituent Hammett sigma constants, which shows a small negative F value. A certain contribution of CO/pi interaction between the lactone carbonyl and the substituted phenyl ring to mediation of the substituent effect is also discussed. The energy profiles of both reaction pathways were analyzed using DFT and RI-MP2 theoretical approaches. Calcula

Název v anglickém jazyce

Substituent Effect on exo Stereoselectivity in the 1,3 Dipolar Cycloaddition Reaction of Tulipalin A with Nitrile Ylides

Popis výsledku anglicky

1,3-Dipolar cycloaddition reactions of dihydro-3-methylene-2(3H)-furanone (tulipalin A) with various benzonitrile(p-X-benzylide) ylides prefer formation of exo-cycloadducts in the extent corresponding to an increasing electron donor character of the substituent X in the para-position of the benzylide phenyl ring of the 1,3-dipolar reagent. The substituent effect on diastereoselectivity of the 1,3-DC reaction is rationalized in terms of CH/pi interaction between the dipole and the dipolarophile in an exo-transition state. The determining role of such an interaction is demonstrated by the correlation of the observed diastereoselectivities with substituent Hammett sigma constants, which shows a small negative F value. A certain contribution of CO/pi interaction between the lactone carbonyl and the substituted phenyl ring to mediation of the substituent effect is also discussed. The energy profiles of both reaction pathways were analyzed using DFT and RI-MP2 theoretical approaches. Calcula

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

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Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2008

Kód důvěrnosti údajů

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

Název periodika

The Journal of Organic Chemistry

ISSN

0022-3263

e-ISSN

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Svazek periodika

73

Číslo periodika v rámci svazku

8

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

8

Strana od-do

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Kód UT WoS článku

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EID výsledku v databázi Scopus

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