0000000000595590
AUTHOR
Simonas Balkaitis
Preparative-Scale Synthesis of Vedejs Chiral DMAP Catalysts
A scalable synthesis of chiral Vedejs-type DMAP catalysts is reported. The key step of the synthesis is amination of the enantiomerically pure 4-chloropyridine derivative using well-defined ZnCl2(amine)2 complexes. A series of Zn(II)–amine complexes have been synthesized to explore the scope of the ZnCl2-mediated amination of 4-halopyridines. Mechanistic studies support a Zn(II)-facilitated nucleophilic aromatic substitution as a plausible mechanism for the chlorine-to-amine exchange.
Acylative Dynamic Kinetic Resolution of Secondary Alcohols: Tandem Catalysis by HyperBTM and Bäckvall's Ruthenium Complex.
Non-enzymatic dynamic kinetic resolution (DKR) of secondary alcohols by enantioselective acylation using an isothiourea-derived HyperBTM catalyst and racemization of slowly reacting alcohol by Backvall's ruthenium complex is reported. The DKR approach features high enantioselectivities (up to 99:1), employs easy-to-handle crystalline 4-nitrophenyl isobutyrate as the acylating reagent, and proceeds at room temperature and under an ambient atmosphere. The stereoinduction model featuring cation-π system interactions between the acylated HyperBTM catalyst and π electrons of an alcohol aryl subunit has been elaborated by DFT calculations.
Otrējo spirtu dinamiskā kinētiskā sadalīšana
Antrinių alkoholių dinaminė kinetinė rezoliucija. Simonas Balkaitis. Darbo vadovas: Dr. chem. Artis Kinēns. Magistrinį darbą sudaro 63 puslapiai, 10 iliustracijų, 31 schema, 14 lentelių, 1 lygtis, 53 literatūros šaltiniai. Darbas parašytas anglų kalba. Pirmiausia buvo ištirta antrinių alkoholių racemizacija įvairių iridžio, rutenio ir geležies katalizatorių pagalba. Tuomet, racemizacijai tinkamiausiuose tirpiklių variantuose buvo tiriama alkoholių kinetinė rezoliucija. Gauti duomenys buvo panaudoti naujos dinaminės kinetinės rezoliucijos procedūros paieškose.
CCDC 1875521: Experimental Crystal Structure Determination
Related Article: Artis Kinens, Simonas Balkaitis, and Edgars Suna|2018|J.Org.Chem.|83|12449|doi:10.1021/acs.joc.8b01687
CCDC 1875522: Experimental Crystal Structure Determination
Related Article: Artis Kinens, Simonas Balkaitis, and Edgars Suna|2018|J.Org.Chem.|83|12449|doi:10.1021/acs.joc.8b01687
CCDC 1875523: Experimental Crystal Structure Determination
Related Article: Artis Kinens, Simonas Balkaitis, and Edgars Suna|2018|J.Org.Chem.|83|12449|doi:10.1021/acs.joc.8b01687
CCDC 1875525: Experimental Crystal Structure Determination
Related Article: Artis Kinens, Simonas Balkaitis, and Edgars Suna|2018|J.Org.Chem.|83|12449|doi:10.1021/acs.joc.8b01687
CCDC 1875524: Experimental Crystal Structure Determination
Related Article: Artis Kinens, Simonas Balkaitis, and Edgars Suna|2018|J.Org.Chem.|83|12449|doi:10.1021/acs.joc.8b01687