Polycyclic N-hetero compounds. XI. The modified Vilsmeier reaction of 4-alkylpyrimidines.
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چکیده
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The use of solid-phase supported 1-N-piperazine-4-N-carboxaldehyde in Vilsmeier reactions.
A Vilsmeier salt supported on solid phase was prepared using piperazine bound to Merrifield resin. Piperazine was selected because it contains two secondary amines: one of the amines is protected upon binding to the resin, and the second was formylated to give resin-1-N-piperazine-4-N-carboxaldehyde (9). Activation of the formamide with either bis(trichloromethyl)carbonate (BTC) or POCl(3) affo...
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heteropoly acids (hpa) and their salts have advantages as catalysts which make them both economically and environmentally attractive, strong br?nsted acidity, exhibiting fast reversible multi-electron redox transformations under rather mild conditions, very high solubility in polar solvents, fairly high thermal stability in the solid states, and efficient oxidizing ability, so that they are imp...
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In the 1980s long-lived radical species were identified in cigarette tar. Since then, environmentally persistent free radicals (EPFRs) have been observed in ambient particulate matter, and have been generated in particulate matter generated from internal combustion engines. For the first time, we measure in situ the formation and decay of EPFRs through the heterogeneous reaction of ozone and se...
متن کاملTheoretical evaluation of medicinal properties for some of N-aryl-3-hydroxypyridine-4-ones derivative compounds
Today, the bidentate ligands 3-hydroxypyridin-4-ones (HPOs) as orally active iron chelating agents have been demonstrated to possess potential for treatment of some human diseases such as iron-overload in thalassaemic patients and malaria. In this research, a series of HPOs with different substitutes and position were theoretically invest
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ژورنال
عنوان ژورنال: Chemical and Pharmaceutical Bulletin
سال: 1976
ISSN: 0009-2363,1347-5223
DOI: 10.1248/cpb.24.1459