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Structure of Chelerythrine Base
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 excessExpand
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Quaternary Benzo[c]phenanthridine Alkaloids
Quaternary Benzo[c]phenanthridine Alkaloids. This review deals with the fully aromatic quaternary benzo[c]phenanthridine alkaloids in several aspects. Firstly nomenclature principles for numberingExpand
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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
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Applications of caged-designed proton sponges in base-catalyzed transformations
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 PudovikExpand
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Microwave-assisted solvent-free intramolecular 1,3-dipolar cycloaddition reactions leading to hexahydrochromeno[4,3-b]pyrroles: scope and limitations
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
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Fused Tetracyclic Heterocycles by Thermally Initiated Intramolecular Criss-Cross Cycloaddition of 3-Substituted Homoallenylaldazines
A thermally initiated intramolecular criss-cross cycloaddition of 3-substituted symmetrical homoallenyl azines (5) was searched. Their cyclization led to interesting new fused heterocyclic systemsExpand
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Sanguinarine pseudobase: re‐examination of NMR assignments using gradient‐enhanced spectroscopy
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 15NExpand
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Molecular and Crystal Structures of Three Berberine Derivatives
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 areExpand
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Microwave-assisted solvent-free synthesis of hexahydrochromeno-[4,3-b]pyrroles
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
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