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Three-component condensation of pyruvic acid with aromatic aldehydes and some aminoazoles was developed as a procedure for the synthesis 5-aryl-5,8-dihydroazolo[1,5-a]pyrimidine-7-carboxylic acids.… (More)
Abstract Reaction of 2-aminothiazoline ( 1 ) with α,β-unsaturated carbonyl compounds 2 under mild conditions (acetone, room temperature) gives two diastereomers 5-R-7-hydroxy-5 H… (More)
Both enantiomers of inherently chiral calixarene carboxylic acids with ABCD substitution patterns have been prepared by the benzoylation of… (More)
A Biginelli-like three-component condensation using 3-amino-1,2,4-triazole as urea component resulted in an unexpected alternative direction of the tetrahydropyrimidine ring formation.
Three-component condensation of 5(3)-amino-3(5)-methylpyrazole with aromatic aldehydes and 1,3-cyclohexanedione afforded mixtures of 3-methyl-4-aryl-2,4,6,7,8,9-hexa… (More)
The direction of the process depends on the temperature regime and on the structure of the starting materials.
Aldol-crotonic condensation of allobetulone and betulonic aldehyde with N-substituted pyrrole-2- and pyrazole-4-carbaldehydes afforded a series of new α,β-unsaturated ketones of lupane series. Their… (More)
Abstract 4‐Hydrazinoquinazoline was found to form new 2‐(3,4‐dihydro‐3oxo‐2H‐[1,2,4]triazino[4,3‐c]quinazolin‐4‐yl)acetic acid with maleic anhydride in on‐step sequence. Proposed heterocyclization… (More)