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Kafra (po)ostaja privilegirano kiralno ogrodje
Sebastijan Ričko
Video in druga učna gradiva
Oznake: chemistry
Odkritje novega tipa visoko aktivnih bifunkcionalnih organokatalizatorjev je pomemben mejnik v razvoju področja organokatalize in organske kemije. Glede na dostopnost obeh enantiomernih oblik kafre iz naravnih virov je odkritje novih organokatalizatorjev pomemben prispevek k trajnostnemu razvoju in ...
Leto: 2017 Vir: videolectures.net
Stereodivergent synthesis of camphor-derived diamines and their application as thiourea organocatalysts
Sebastijan Ričko, Franc Požgan, Bogdan Štefane, Jurij Svete, Amalija Golobič, Uroš Grošelj
Izvirni znanstveni članek
Oznake: (+)-kafra;diamini;tiosečnina;bifunkcionalni organokatalizatorji;asimetrična sinteza;(+)-camphor;diamines;thiourea;bifunctional organocatalysts;asymmetric synthesis;
A series of 18 regio- and stereo-chemically diverse chiral non-racemic 1,2-, 1,3-, and 1,4-diamines have been synthesized from commercial (1S)-(+)-ketopinic acid and (1S)-(+)-10-camphorsulfonic acid. The structures of the diamines are all based on the D-(+)-camphor scaffold and feature isomeric dive ...
Leto: 2020 Vir: Fakulteta za kemijo in kemijsko tehnologijo (UL FKKT)
Double spirocyclization of arylidene-[Delta] [sup] 2-pyrrolin-4-ones with 3-isothiocyanato oxindoles
Sebastijan Ričko, Žan Testen, Luka Ciber, Franc Požgan, Bogdan Štefane, Helena Brodnik Žugelj, Jurij Svete, Uroš Grošelj
Izvirni znanstveni članek
Oznake: organokatalizatorji;piroloni;spiroheterociklizacija;3-izotiocianato oksindoli;kaskadne reakcije;spiro spojine;organocatalysis;pyrrolones;spiroheterocyclization;3-isothiocyanato oxindoles;cascade reaction;spiro compounds;
Arylidene-∆$^2$-pyrrolin-4-ones undergo organocatalyzed double spirocyclization with 3-isothiocianato oxindoles in a domino 1,4/1,2-addition sequence. The products contain three contiguous stereocenters (ee up to 98%, dr up to 99:1, 12 examples). The absolute configuration of the major diastereomer ...
Leto: 2020 Vir: Fakulteta za kemijo in kemijsko tehnologijo (UL FKKT)
Mechanistic insights into annulation of arylidene- [Delta] [sup] 2-pyrrolin-4-ones by cinchona squaramide-based organocatalysts
Luka Ciber, Sebastijan Ričko, Jure Gregorc, Franc Požgan, Jurij Svete, Helena Brodnik Žugelj, Bogdan Štefane, Uroš Grošelj
Izvirni znanstveni članek
Oznake: organokataliza;asimetrična sinteza;enantioselektivnost;učinki topil;piroloni;psevdo-enantiomerne konformacije katalizatorja;organocatalysis;asymmetric synthesis;enantioselectivity;solvent effects;pyrrolone;pseudo-enantiomeric catalyst conformations;
Arylidene-Δ2-pyrrolin-4-ones undergo organocatalyzed annulation with malononitrile, furnishing dihydropyrano[3,2-b]pyrroles (18 examples, 0–77% ee in dichloromethane, 11–44% ee in methanol). The products could be enantiomerically enriched by trituration (11 examples, 95–99% ee). Enantioselectivity w ...
Leto: 2022 Vir: Fakulteta za kemijo in kemijsko tehnologijo (UL FKKT)
2-acyl-1-aryl-6,7-dihydro-1H,5H-pyrazolo[1,2-a]pyrazole derivatives
Nejc Petek, Bibi Erjavec, Dejan Slapšak, Aljaž Gaber, Uroš Grošelj, Franc Požgan, Sebastijan Ričko, Bogdan Štefane, Marina Klemenčič, Jurij Svete
Izvirni znanstveni članek
Oznake: 6,7-dihidro-1H,5H-pirazolo[1,2-a]pirazoli;benzotriazolidi;fluorescentno označevanje;biokonjugacija;solvatokromija;6,7-dihydro-1H,5H-pyrazolo[1,2-a]pyrazole s;benzotriazolides;fluorescent imaging;bioconjugation;solvatochromism;
A series of thirteen 2-acyl-6,7-dihydro-1H,5H-pyrazolo[1,2-a]pyrazole derivatives were synthesized by using a copper-catalyzed azomethine-imine-alkyne cycloaddition as a key step. These bimane-related fluorescent compounds with λ$_{ex}$ = 338–400 nm and λ$_{em}$ = 522–644 nm exhibit interesting and ...
Leto: 2022 Vir: Fakulteta za kemijo in kemijsko tehnologijo (UL FKKT)
Št. zadetkov: 5
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