Zobrazeno 1 - 10
of 55
pro vyhledávání: '"Jan Plenkiewicz"'
Publikováno v:
Beilstein Journal of Organic Chemistry, Vol 9, Iss 1, Pp 516-525 (2013)
Racemic 1-(β-hydroxypropyl)azoles were prepared by solvent-free direct regioselective ring opening of 1,2-propylene oxide with imidazole or 1,2,4-triazole. Lipase-catalyzed transesterification of alcohols with vinyl acetate resulted in kinetic enant
Externí odkaz:
https://doaj.org/article/00c1f94e68ba4b418859c0c0ef9c9a6f
Publikováno v:
ARKIVOC, Vol 2012, Iss 8, Pp 262-281 (2012)
Externí odkaz:
https://doaj.org/article/f34363985cc74899ac011a3ac67d9c91
Autor:
Monika Wielechowska, Paweł Borowiecki, Małgorzata Milner-Krawczyk, Jan Plenkiewicz, Dominika Brzezińska
Publikováno v:
European Journal of Organic Chemistry. 2013:712-720
A simple and efficient procedure for the synthesis of new optically active imidazolium and triazolium ionic liquids in a three step reaction sequence is described. In the first step, the ring opening of 1,2-butylene oxide by imidazole or 1,2,4-triazo
Publikováno v:
ARKIVOC, Vol 2012, Iss 8, Pp 262-281 (2012)
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The synthesis of optically active ionic liquids, in a four-step reaction sequence, is described. In the first step an oxirane ring of cyclohexene oxide was opened with 1,2,4-triazole, yielding a racemic mixture of (1R,2R)- and (1S,2S)-2-(1H-1,2,4-tri
Publikováno v:
Tetrahedron: Asymmetry. 23:136-143
A simple chemoenzymatic method for the preparation of optically active (5-aryltetrazolyl-2)-4-butan-2-ol, (5-aryltetrazolyl-2)-propan-2-ol, and their acetates has been developed. The starting compounds (5-aryltetrazolyl-2)-4-butan-2-one and (5-arylte
Publikováno v:
Synthetic Communications. 41:1999-2006
A convenient and simple method for the preparation of previously unknown β-acetoxy thiocyanates by regioselective ring opening of the corresponding oxiranes with thiocyanate anion followed by acetylation is described. The shorter reaction times, bet
Autor:
Jan Plenkiewicz, Marcin Poterała
Publikováno v:
Tetrahedron: Asymmetry. 22:294-299
New functionalized optically active N-methylimidazolium ionic liquids with an asymmetric center at the β-position to the imdazole ring were synthesized as bromide salts from optically active α-hydroxycarboxylic acids. The bromide anions were exchan
Autor:
Malgorzata Zagozda, Jan Plenkiewicz
Publikováno v:
Tetrahedron: Asymmetry. 19:1455-1460
Biotransformations of five substituted cis - and trans -oxiranecarbonitriles with Mortierella isabellina DSM 1414, a microbial whole-cell catalyst producing epoxide hydrolases, were investigated. The reactions were stopped when the conversion of the
Autor:
Edyta Łukowska, Jan Plenkiewicz
Publikováno v:
Tetrahedron: Asymmetry. 18:493-499
A simple method for the preparation of optically active 2-(arylsulfanylmethyl)thiiranes and 2-(aryloxymethyl)thiiranes from the corresponding 3-thiocyanatopropan-2-ols and their acetates was developed. The starting enantiomerically enriched β-thiocy
Publikováno v:
The Journal of organic chemistry. 81(2)
A novel synthetic route for preparation of proxyphylline enantiomers using a kinetic resolution (KR) procedure as the key step is presented. The reactions were catalyzed by immobilized Candida antarctica lipase B in acetonitrile. Three types of react