Zobrazeno 1 - 10
of 16
pro vyhledávání: '"Erik Ceulemans"'
Publikováno v:
Tetrahedron. 58:531-544
Several different heterocyclic aldehydes, derived from pyrazole, pyrimidine, pyridine, indole and thiazole, were converted to polyheterocyclic compounds containing four to seven rings. The key steps in the sequence were a Knoevenagel condensation of
Publikováno v:
Tetrahedron. 57:9123-9129
5-Amino-1,2-azoles react with aromatic and heterocyclic aldehydes, having reactive halogen in ortho-position, and yield pyrazolo[3,4-b;2,3-b]quinolines, bispyrazolo[3,4-b;4′,3′-e]pyridines and their heterocyclic analogs, respectively as [1+1] or
Publikováno v:
Tetrahedron Letters. 40:7545-7548
A new type of double picket-fence porphyrin, bearing pyrimidine rings at the meso-positions was prepared from the corresponding pyrimidine-5-aldehydes using either Rothemund or McDonald condensation reactions.
Publikováno v:
Journal of Molecular Catalysis A: Chemical. 144:373-377
The use of [5,10,15,20-tetrakis(2,6-dichlorophenyl)porphyrinato] manganese(III) chloride (TDCPP(Mn)Cl) in the presence of an axial ligand and embedded in a polydimethylsiloxane (PDMS) membrane is reported for the epoxidation of an enol with aqueous H
Publikováno v:
Tetrahedron. 55:1977-1988
The 4-oxoalkyl- and 4-iminoalkyl-5-azidothiazoles undergo a ring transformation with nitrogen loss at relatively low temperatures to afford 4-cyanooxazoles and 4-cyanoimidazoles, respectively. The mechanism, which is thought to involve a ring opening
Publikováno v:
Tetrahedron. 53:9657-9668
Rate measurements for thermolysis of 4-azidothiazoles in p-xylene solution have identified neighbouring group effects from nitro (19-fold rate increase), phenyliminomethyl (16), formyl (4.5) and acetyl (2.2) substituents in the 5-position. These effe
Publikováno v:
ChemInform. 28
Publikováno v:
ChemInform. 29
Publikováno v:
ChemInform. 30
The 4-oxoalkyl- and 4-iminoalkyl-5-azidothiazoles undergo a ring transformation with nitrogen loss at relatively low temperatures to afford 4-cyanooxazoles and 4-cyanoimidazoles, respectively. The mechanism, which is thought to involve a ring opening
Publikováno v:
ChemInform. 30
A new type of double picket-fence porphyrin, bearing pyrimidine rings at the meso-positions was prepared from the corresponding pyrimidine-5-aldehydes using either Rothemund or McDonald condensation reactions.