几种二卤代吡啶与PhSeNa或HeSeLi在DMF中的反应提供了高产率的单取代产物。用过量的PhSeNa容易得到双(苯基硒烯基)吡啶,而用过量的MeSeLi,由于S N 2取代过程,最初形成的卤代吡啶基甲基硒化物而不是芳香族取代基发生脱烷基反应,得到卤代吡啶基硒酸根阴离子。加入-丙基碘化物,得到卤代吡啶基-丙基硒化物。用过量的MeSeLi处理这些化合物可得到(获得了直接用烷基化剂处理的-丙基硒烯基)吡啶基硒烯酸根阴离子,并获得了高产率的双(烷基硒烯基)吡啶。所有这些亲核芳族取代反应都是完全区域特异性的。
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 general procedure for the synthesis of methylthio-, methylseleno- and methyltelluro-substituted aromatic compounds
作者:Lars Engman、Jonas S.E. Hellberg
DOI:10.1016/0022-328x(85)80366-1
日期:1985.12
A one-pot procedure is described which allows the facile introduction of one or two methylchalcogeno groups into a variety of monobromo or dibromo aromatics. The bromo compounds were converted to their corresponding lithio derivatives by treatment with t-butyllithium in tetrahydrofuran at −78°C, and these derivatives were then treated, at ambient temperature with elemental sulfur, selenium, or tellurium
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
A mechanistic study of the synthesis, single crystal X-ray data and anticarcinogenic potential of bis(2-pyridyl)selenides and -diselenides
作者:Jaspreet S. Dhau、Avtar Singh、Amritpal Singh、Neha Sharma、Paula Brandão、Vítor Félix、Baljinder Singh、Vishal Sharma
DOI:10.1039/c5ra15577k
日期:——
A mechanistic study on LiAlH4 assisted scission of C–Se bond in bis(2-pyridyl)diselenides leading to bis(2-pyridyl)selenides generation has been presented.
A NEW AND CONVENIENT ROUTE TO 2,2′-DIPYRIDYL DISELENIDE/DITELLURIDE AND SOME OF THEIR ALKYL/ARYL DERIVATIVES THROUGH BF<sub>3</sub>-COMPLEXED PYRIDYL CARBANION
作者:K. K. Bhasin、B. S. Bhandal、J. Singh、N. Singh、K. N. Singh、P. Singh
DOI:10.1081/scc-120003627
日期:2002.1
ABSTRACT Synthesis of 2,2′-dipyridyl diselenide/ditelluride and some alkyl/aryl pyridyl selenide/telluride is reported.