Reactions of 0.5 eq. of the dinuclear complexes [(g-arene)Ru(l-Cl)Cl]2 (arene = g-C6H6, g-p-PrC6H4Me) and [(Cp*)M(l-Cl)Cl]2 (M = Rh, Ir; Cp* = g-C5Me5) with 4,6-disubstituted pyrazolyl-pyrimidine ligands (L) viz. 4,6-bis(pyrazolyl)pyrimidine (L1), 4,6-bis(3-methyl-pyrazolyl)pyrimidine (L2), 4,6-bis(3,5dimethyl-pyrazolyl)pyrimidine (L3) lead to the formation of the cationic mononuclear complexes...

Biacetyl reacts with oxone to give bis-dioxirane [3,3'-dimethyl-3,3'-bidioxirane, 3B] and mono-dioxirane [1-(3-methyl-dioxiran-3-yl)ethanone, 3A)]. Bis-dioxirane 3B is formed when two oxygens are incorporated into biacetyl, while mono-dioxirane 3A incorporated only one. A greater stability is observed in 3B compared to 3A, which is attributed to an alpha-dioxiranyl (anomeric) effect in the form...

Hydrazonyl bromides 2a,b reacted with active methylene compounds (dibenzoylmethane, acetylacetone, ethyl acetoacetate, phenacyl cyanide, acetoacetanilide, ethyl cyanoacetate, cyanoacetamide and malononitrile) to afford the corresponding 1,3,4,5- tetrasubstituted pyrazole derivatives 5-12a,b. Reaction of 12a,b with formamide, formic acid and triethyl orthoformate give the pyrazolo[3,4-d]pyrimidi...

4-Imino-1-p-tolyl-1,4-dihydropyrazolo[3,4-d]pyrimidin-5-ylamine (2) and (1-p-tolyl-1H-pyrazolo[3,4-d]pyrimidin-4-yl)-hydrazine (3) were prepared starting from ethyl 4-cyano-1-p-tolyl-1H-pyrazol-5-ylimidoformate (1). The structure of compound 3 was confirmed through preparation of the pyrazole derivatives 4 and 5. Also, the synthesis and structural characterization of pyrazolo[4,3-e][1,2,4]triaz...

The antiviral effects of some pyrimidine derivatives were investigated using plaque reduction assay. Pyrimidine derivatives were dissolved in suitable vehicles and different concentrations of each compound were prepared. After several enriching stages of phage CP51, the phage numbers in phage lysates were determined. To ascertain whether pyrimidine derivatives have the ability to inhibit viral ...

Convenient syntheses of mono- and bis-imidazolium 1,3,5-triazine derivatives bearing piperidine and morpholine substituents are reported. In situ deprotonation of the mono-imidazolium salts and reaction with Ag2O or Au(tht)Cl (tht = tetrahydrothiophene) precursors affords the corresponding Ag(NHC)Cl and Au(NHC)Cl carbene complexes. In the presence of Ag(I) or Au(I) salts the bis-imidazolium pin...

Communiols A–D (1–4), new tetrahydrofuran and bis-tetrahydrofuran derivatives, have been isolated from cultures of the coprophilous fungus Podospora communis, and identified by spectroscopic methods. 2004 Elsevier Ltd. All rights reserved.

A series of b-cyclodextrin (b-CD) derivatives modified by L-cystine, including 3,30-L-cystine-bridged bis(b-CD) (2), 3-Lcystine-b-CD (3), 6,60-L-cystine-bridged bis(b-CD) (4) and 6-L-cystine-b-CD (5), were synthesised inmoderate yields by the reaction of L-cystine with mono-[2-O-(p-tolysulfonyl)]-b-CD (2-O-Ts-b-CD) or mono-[6-O-(p-tolysulfonyl)]-b-CD (6-OTs-b-CD). Their binding manners and incl...

Pills of Mefenamic acid were  employed as effective catalysts in the three component reaction of aromatic  aldehydes,  malononitrile,  as  well  as  4-hydroxycoumarin  or  barbituric  acid  in  aqueous solution,  using  reflux  conditions  in  order  to  synthesize  derivatives  of  dihydropyrano[2,3-c]chromene and pyrano[2,3-d]pyrimidine, correspondingly. Among the benefits of this technique, ...