乙酸2-硒代氧-2- H-吡啶-1-基酯与苯炔的反应:苯并[ b ]硒代[2,3- b ]吡啶的简便途径
摘要:
苯炔及其3,4,5,6-四苯基,3-和4-甲基,3-甲氧基和4,5-二氟衍生物与乙酸2-硒代氧-2 H-吡啶-1-基酯4a-e反应得到适量收率的苯并[ b ]硒代[2,3- b ]吡啶10-15。苯并炔是通过以下一种或多种方法生成的:用硝酸异戊酯将邻氨基苯甲酸5a-g重氮化;将5a-g邻氨基苯甲酸重氮化。2-重氮碘苯甲酸盐酸盐的温和热分解6a-d处理(苯基)[ o-三氟甲磺酸-((三甲基甲硅烷基)苯基]三氟甲磺酸鎓盐(7);氟化铯制备2-三甲基甲硅烷基苯基三氟甲磺酸酯8a-c。在所有反应中,还获得了相应的2-(甲基硒烯基)吡啶16a-d,表明这些反应可能涉及通过SET(单电子转移)将硒添加到苯炔中。
A novel and convenient synthesis towards 2-pyridylselenium compounds: X-ray crystal structure of 4,4′-dimethyl-2,2′-dipyridyl diselenide and tris(2-pyridylseleno)methane
作者:K.K Bhasin、Jaspreet Singh
DOI:10.1016/s0022-328x(02)01627-3
日期:2002.9
hydrazine hydrate in sodium hydroxide reacts in situ with 2-bromopyridines to afford the title compounds in good to excellent yields. Hydrazine hydrate readily cleaves the selenium-selenium bond in these diselenides to generate 2-pyridylselenolate anion, which reacts with halomethanes to afford 2-pyridylseleno methanes. X-ray crystalstructure of 4,4′-dimethyl-2,2′-dipyridyl diselenide (4) and tris(2-pyridylseleno)methane
Complex-Induced Proximity Effect in the Regioselective Lithiation of Pyridine Derivatives
作者:Jaspreet S. Dhau、Amritpal Singh、Yoganjaneyulu Kasetti、P. V. Bharatam
DOI:10.1002/ejoc.201101592
日期:2012.3
The regioselective ring lithiation of BF3-complexed 3-picoline (1a), 3,4-lutidine (1b), and 3,5-lutidine (1c) was studied. The dilithiation of 1a, 1b, and 1c was also investigated to experimentally explore the relative preference of the sites on the substituted pyridine ring for lithiation. The role of the complex-induced proximity effect (CIPE) for inducing lithiation in these moieties was investigated
Preparation and Characterization of Methyl Substituted 2,2′-Dipyridyl Diselenides, 2,2′-Dipyridyl Ditellurides, and Their Derivatives
作者:K. K. Bhasin、V. K. Jain、H. Kumar、Shweta Sharma、S. K. Mehta、Jaspreet Singh
DOI:10.1081/scc-120016362
日期:2003.1.4
Abstract A number of methylsubstituted 2,2′-dipyridyl diselenides and -ditellurides have been prepared. Effect of the solvent and the substituents on the rate of these reactions have also been studied. The preparation of 2-methylseleno/telluro picolines by reductive cleavage of the diselenides and ditellurides and by one pot reaction using n-BuLi at −78°C in THF is reported.