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- Publications
- Influence
Structure of Chelerythrine Base
- J. Dostal, E. Táborská, J. Slavík, M. Potáček, E. Hoffmann
- Chemistry
- 1 May 1995
The structure of chelerythrine free base was examined. When chelerythrine chloride [1b] was treated with aqueous K2CO3 solution, bis[6-(5,6-dihydrochelerythrinyl)] ether [3] was obtained. An excess… Expand
Quaternary Benzo[c]phenanthridine Alkaloids
- J. Dostal, M. Potáček
- Chemistry
- 1990
Quaternary Benzo[c]phenanthridine Alkaloids. This review deals
with the fully aromatic quaternary benzo[c]phenanthridine
alkaloids in several aspects. Firstly nomenclature principles
for numbering… Expand
Berberine and coptisine free bases
Abstract The free bases of protoberberine alkaloids berberine and coptisine and related compounds have been examined. The 1H and 13C NMR data of 8-hydroxy-7,8-dihydroberberine (2a),… Expand
Applications of caged-designed proton sponges in base-catalyzed transformations
- J. Galeta, M. Potáček
- Chemistry
- 1 December 2014
Superbasic properties of caged proton sponges (PSs) –
substituted diazatetracyclo[4.4.0.13,10.15,8]dodecanes (DTDs) –
were utilized in Knoevenagel and Claisen–Schmidt condensations,
the Pudovik… Expand
(+)-Catechin: Benzoyl Protection of OH Groups and NMR Study of Products
- R. Marek, A. D. Groot, R. Dommisse, G. Lemiére, M. Potáček
- Chemistry
- 1997
- 1
- 1
Microwave-assisted solvent-free intramolecular 1,3-dipolar cycloaddition reactions leading to hexahydrochromeno[4,3-b]pyrroles: scope and limitations
- Jiří Pospíšil, M. Potáček
- Chemistry
- 8 January 2007
We report the microwave-assisted solvent-free synthesis of hexahydrochromeno[4,3-b]pyrroles. Intramolecular 1,3-dipolar cycloadditions proceed under these conditions within 15-40 min in 16-84%… Expand
Fused Tetracyclic Heterocycles by Thermally Initiated Intramolecular Criss-Cross Cycloaddition of 3-Substituted Homoallenylaldazines
- Hana Zachová, S. Man, M. Nečas, M. Potáček
- Chemistry
- 1 June 2005
A thermally initiated intramolecular criss-cross cycloaddition
of 3-substituted symmetrical homoallenyl azines (5) was
searched. Their cyclization led to interesting new fused
heterocyclic systems… Expand
Sanguinarine pseudobase: re‐examination of NMR assignments using gradient‐enhanced spectroscopy
- J. Dostal, R. Marek, J. Slavík, E. Táborská, M. Potáček, V. Sklenár̆
- Chemistry
- 1 November 1998
The formation of sanguinarine pseudobase (6‐hydroxydihydrosanguinarine) was studied by 1D and 2D NMR spectroscopy. The unequivocal evidence of a hemiaminal OH group and unambiguous 1H, 13C and 15N… Expand
Molecular and Crystal Structures of Three Berberine Derivatives
- S. Man, M. Potáček, M. Nečas, Z. Ẑák, J. Dostal
- Chemistry
- Molecules : A Journal of Synthetic Chemistry and…
- 30 April 2001
Berberine azide, berberine thiocyanate, and 8-cyano-8H-berberine were prepared from berberine chloride, a quaternary protoberberine alkaloid. The molecular and crystal structures of all compounds are… Expand
Microwave-assisted solvent-free synthesis of hexahydrochromeno-[4,3-b]pyrroles
- Jiří Pospíšil, M. Potáček
- Chemistry
- 1 February 2004
We report the microwave-assisted solvent-free synthesis of hexahydrochromeno[4,3-b]pyrroles. Intramolecular 1,3-dipolar cycloadditions proceed under these conditions within 15 min in 80% yields.… Expand