As a part of systematic investigation of biologically active compound, new azo dye ligand N-(4, 6-dimethylpyrimidin-2-yl)-4-((2-hydroxynaphthalen-1-yl) diazenyl) benzene sulfonamide has been synthesized by diazotization of 4-amino-N-(4, 6-dimethylpyrimidin-2-yl) benzenesulfonamide and coupled with coupling compound, naphthalen-2-ol. A new series of Ni (II), Cu (II), and Zn (II) complexes derive...

The structures of some azopigments obtained by diazotization of conjugated and unconjugated bile pigments with diazotized ethyl anthranilate were studied by mass spectrometry. The alpha(0)-azopigments derived from rat bile and human bile were shown to be identical (t.l.c. and mass spectra) with azobilirubin derived from unconjugated bilirubin. The presence of two methyl vinyl isomers (Ia) and (...

Mitomycin C (MMC) binds to DNA after its reductive activation by catalytic hydrogenation with Pd on charcoal. Three modified nucleotides, named MG-1, MG-2, and MA, were isolated from the modified DNA after enzymatic hydrolysis to 5'-nucleotides. The structures of these modified nucleotides were deduced from their 1H-NMR and UV spectra, and from studies of the chemically transformed derivatives ...

Commercial fungal amylase (diastase) has been immobilized through diazotization onto zirconia coated arylamine glass beads, affixed inside a plastic beaker. The immobilized enzyme retained 73.3% of the initial activity of free enzyme with a conjugation yield of 8 mg/g. Optimum pH of enzyme was decreased, while temperatures for maximum activity, energy of activation, time of incubation and Km fo...

We report efficient syntheses of the clinical agent cladribine (2-chloro-2'-deoxyadenosine, CldAdo), which is the drug of choice against hairy-cell leukemia and other neoplasms, from 2'-deoxyguanosine. Treatment of 3',5'-di-O-acetyl- or benzoyl-2'-deoxyguanosine (1) with 2,4,6-triisopropyl- or 4-methylbenzenesulfonyl chloride gave high yields of the 6-O-arylsulfonyl derivatives 2 or 2'b. Deoxyc...

In this paper, a micro-fluidic optimized process for the continuous flow synthesis of azo compounds is presented. The continuous flow synthesis of Sudan II azo dye was used as a model reaction for the study. At found optimal azo coupling reaction temperature and pH an investigation of the optimum flow rates of the reactants for the diazotization and azo coupling reactions in Little Things Facto...

An efficient, safe and improved process for the preparation of ticagrelor 1, a platelet aggregation inhibitor is described. Synthesis comprises the condensation of pyrimidine amine derivative 14 with cyclopentyl derivative 13 in ethylene glycol followed by construction of triazole compound 16 by diazotization of the obtained intermediate 15 with a green and safer reagent "Resin-NO2" in water an...

A rapid and sensitive flow-injection spectrophotometric method is proposed for the determination of sulfadiazine and sulfamethoxazole. This method is based on the diazotization of sulfonamide with sodium nitrite, and a coupling reaction of the diazo-compound with alpha-naphthylamine. The optimum experimental conditions are obtained by using the controlled and weighted centroid simplex method. T...

The purine antagonists with which this paper is concerned are of interest in the chemotherapy of neoplastic diseases and belong to either of the two groups: the substituted purines such as 6-mercaptopurine (6MP) (1) and isomers of purines such as 4-aminopyrazolo (3,4-d) pyrimidine (4APP) (2). In connection with their pharmacological studies (3), it is essential to have a method available for th...

A novel synthesis of trimethylsilyldiazomethane (TMSCHN2 ) by diazotization of trimethylsilylmethylamine (TMSCH2 NH2 ) is reported using batch and continuous flow synthesis. The latter affords a daily production of 275 g (2.4 mol) of TMSCHN2 . Other silylated methylamines were also successfully reacted under the developed reaction conditions to furnish various silicon-bearing diazomethane reage...