Tautomeric Cyclic Thiones. Part III. Preparation of N- and S-Methyl Derivatives of Some Azoline-2-thiones.
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Preparation of 4-Alkoxy-1-hydroxypyridine-2-thiones
Reactions of 2-chloro-4-fluoropyridine (8), 2-chloro-4-nitropyridine (9), and their corresponding N-oxides 7 and 3 with the n-heptanolate anion were investigated in three solvents. The desired 2-chloro-4-heptyloxypyridine-N-oxide (4a) was obtained most efficiently from 3 in DMSO. A reaction of 4a with AcSNa followed by deacetylation with MeONa gave the sodium salt of 4-heptyloxy-1-hydroxypyridi...
متن کاملpart a: application of n-(p-toluenesulfonyl) imidazole (tsim) and triphenylphosphine/carbon tetrachloride in several organic transformations part b: application of 8-bromocaffeine for synthesis of some novel 8-caffeinyl derivatives
بخش اول این پایان نامه به طور عمده بر توسعه کاربردهای جدید n-(پارا-تولوئن سولفونیل) ایمیدازول (tsim) و تری فنیل فسفین/ تتراکلرید کربن در تبدیل گروههای عاملی به یکدیگر استوار است. نظر به تنوع زیاد، دردسترس بودن، سمیت کمتر و نقل و انتقال آسان تر الکل ها نسبت به آلکیل هالیدها، تبدیل مستقیم گروه هیدروکسیل به گروه های عاملی دیگر مثل آزید، نیتریل و استر یکی از مهم ترین تبدیلات در سنتزهای آلی است. با ...
15 صفحه اولSynthesis and reactions of C-phosphanylated thiazol-2-thiones.
The facile regioselective synthesis of the P(iii) substituted thiazol-2-thione 2 is presented. Reaction of 2 with hydrogenperoxide-urea, elemental sulfur and selenium resulted in P(v) chalcogenide thiazol-2-thiones 3-5. All compounds were characterized using (31)P, (1)H, (13)C NMR, IR and elemental analyses and, additionally, by the single-crystal X-ray diffraction technique. Oxidative desulfur...
متن کاملOnes, thiones, and N-oxides: an exercise in imidazole chemistry.
General Procedure: 1-Propylimidazole-N-oxide (2a) 1 (1.0 g, 4.1 mmol) and 1,3,5-tripropylhexahydro-1,3,5triazine (0.5 g, 2.4 mmol) were dissolved in ethanol (20 mL). The reaction mixture was heated to reflux for 10 h. The light brown solution was cooled to room temperature and the solvent removed under reduced pressure. The oily residue solidified upon trituration with diethylether to give 2a a...
متن کاملMulticomponent synthesis of 3,6-dihydro-2H-1,3-thiazine-2-thiones.
Non-fused 3,6-dihydro-2H-1,3-thiazine-2-thiones constitute a so far rather unexplored class of compounds, with the latest report dating back more than two decades. Thiazine-2-thiones contain an endocyclic dithiocarbamate group, which is often found in pesticides, in substrates for radical chemistry and in synthetic intermediates towards thioureas and amidines. We now report the multicomponent r...
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ژورنال
عنوان ژورنال: Acta Chemica Scandinavica
سال: 1969
ISSN: 0904-213X
DOI: 10.3891/acta.chem.scand.23-2879