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A. E. Rashad H. H. Sayed A. H. Shamroukh H. M. Awad 《Phosphorus, sulfur, and silicon and the related elements》2013,188(12):2767-2777
Compounds 2 and 9 were formed using 3-(4-chloro-phenyl)-1-pyridin-2-yl propenone ( 1 ) and malononitrile or ethyl cyanoacetate, respectively. The pyridine derivative 2 was in turn used as a precursor for the preparation of some pyridopyrimidine and fused pyridopyrimidine derivatives 3–8 On the other hand, the pyridine derivative 9 was used for the preparation of thienopyridine derivatives 11 and 12 Nitrozation of compound 12 afforded pyridothienotriazine derivative 13 Some of the prepared products showed potent antimicrobial activity. 相似文献
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B. S. Thyagarajan K. C. Majumdar 《Phosphorus, sulfur, and silicon and the related elements》2013,188(1):55-66
Abstract Aryloxy, arylmercapto, arylsulfonyl and dialkylamino derivatives of 2,3-dimethylbenzo(b)thiophenes exhibit interesting modes of mass spectral fragmentations. Selectivity in relative ease of fragmentation of different functions is noted. Smiles rearrangement is observed in the sulfone derivatives 相似文献
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A. A. Harb A. M. Hussein I. A. Mousa 《Phosphorus, sulfur, and silicon and the related elements》2013,188(10):2247-2261
3-Oxo-N-{4-[(pyrimidin-2-ylamino)sulfonyl]phenyl}butanamide 1 reacts with arylidinecyanothioacetamide in refluxing ethanolic TEA to give the pyridinethione 2 rather than thiopyrane 4. Compound 2 reacts with α-haloketones to give the s-alkylated derivatives 7a–e. Compound 7a–e undergoes cyclization into thieno[2,3-b]pyridine derivatives 8a–e. The saponification of 8a gives the amino acid 9, which affords 10 when refluxed in Ac2O. The treatment of 10 with NH4OAc/AcOH gives 11. Compound II is also obtained when 8e is refluxed in Ac2O. The reaction of 8a with hydrazine hydrate gives 12 and with formamide gives 13. Compound 13 also is obtained from the reaction of 8e with triethylorthoformate. The acetylation of 8a with Ac2O gives the amide derivative 14, which, on treatment with aromatic amines, affords 15a–c. Compounds 15a–c are cyclized with H2SO4 to 16a–c. Compound 16 is obtained also from the acetylation of compound 8c, d by Ac2O. Reactions of compound 8e with CS2 in refluxing dioxane afford 17. The diazotization and self-coupling of 8e give the pyridothienotriazine 18. Finally, the chloronation of compound 13 with POCl3 affords the chloride derivative 19. 相似文献
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Shin-Ichi Nishi Minoru Matsuda 《Phosphorus, sulfur, and silicon and the related elements》2013,188(1-2):181-185
Abstract The free ion of fluorenone radical anion (FlO) was formed even in tetrahydrofuran (THF) by the flash photolysis of the alkali-metal salts of the sulfonyl carbanion in the presence of neutral FlO and this was attributed to the ion pair structure of the sulfonyl carbanions. 相似文献
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