benzo[b]furans and 3-methyl-2-substituted benzo[b]thiophenes using low-cost, abundant, and easy-to-use solid calcium carbide instead of flammable and explosive gaseous acetylene as an original alkyne source, o-bromophenyl ethers or o-bromophenyl thioethers as substrates through an intramolecular carbanion-yne cyclization in a 5-exo-dig manner, and subsequent double-bond isomerization is described.
一种使用低成本、丰富且易于使用的固体碳化钙来简便构建 3-甲基-2-取代苯并[ b ]呋喃和 3-甲基-2-取代苯并[ b ]噻吩的简明方法描述了以易燃易爆的气态乙炔为原始炔烃源,以邻溴苯醚或邻溴苯硫醚为底物,通过5- exo-dig方式进行分子内碳负离子-炔环化,以及随后的双键异构化。两个C-C键的同时形成是通过一步路线实现的。该方法的优点还包括底物范围广、产率高和后处理操作简单。该合成策略也适用于克级。
Werner, Recueil des Travaux Chimiques des Pays-Bas, 1949, vol. 68, p. 509,515, 516
作者:Werner
DOI:——
日期:——
CROISY, A.;MISPELTER, J.;LHOSTE, J. -M.;ZAJDELA, F.;JACQUIGNON, P., J. HETEROCYCL. CHEM., 1984, 21, N 2, 353-359
作者:CROISY, A.、MISPELTER, J.、LHOSTE, J. -M.、ZAJDELA, F.、JACQUIGNON, P.
DOI:——
日期:——
Thiophene analogues of carcinogenic polycyclic hydrocarbons. Elbs pyrolysis of various aroylmethylbenzo[<i>b</i>]thiophenes
benzophenanthrothiophenes 14–17 through Elbs cyclodehydration of ortho-methylated aroylbenzo[b]thiophenes is described. The occurrence of a rearrangement of the thiophene ring in the course of the cyclization is discussed as well as the influence of the temperature on a concurrent cyclodehydration process. Several of these poly-condensed thiophenes were found carcinogenic in mice.
描述了通过邻甲基化的芳酰基苯并[ b ]噻吩的Elbs环脱水反应合成苯并萘噻吩9和10以及苯并噻吩噻吩14-17。讨论了环化过程中噻吩环重排的发生以及温度对同时进行的环脱水过程的影响。发现这些缩聚噻吩中的几种在小鼠中具有致癌性。
Copper-catalyzed synthesis of 2-acylbenzo[<i>b</i>]thiophenes from 3-(2-iodophenyl)-1-arylpropan-1-ones and potassium sulfide under aerobic conditions
A method was developed for the synthesis of 2-acylbenzo[b]thiophenes via a copper-catalyzed sulfuration of 3-(2-iodophenyl)-1-arylpropan-1-ones with K2S.