在SnCl 4或SnCl存在下,用二氯甲基甲基醚处理5,12-二烷基-6,7-二芳基取代的5,12-二氢吲哚并[3,2- a ]咔唑的区域选择性双甲酰化和乙酰化的有效方法在AlCl 3存在下,用乙酰氯与乙酰氯分别制得2,9-二甲酰基或2,9-二乙酰基衍生物。此外,当新的2,9-双(喹喔啉-2-基)-和2,9-双(苯并[ g ]喹喔啉-2-基)衍生物是通过微波促进SeO 2氧化含二乙酰基的底物而形成的。生成相应的二乙醛,然后使这些中间体分别与邻苯基苯二胺或2,3-二氨基萘反应。研究了一些5,12-二氢吲哚并[3,2- a ]咔唑的基本光学和电化学性质。
A Pd-catalyzed novel cascade reaction has been developed for the synthesis of indolo[3,2a]carbazoles involving multiple C–H transformation–annulations between the indoles and alkynes. The method involves molecular oxygen as the sole oxidant and is an effective and step-economic process.
已开发了一种钯催化的新型级联反应,用于吲哚[3,2 a ]咔唑的合成,涉及吲哚和炔烃之间的多次CH-H转化。该方法以分子氧作为唯一氧化剂,是一种有效且经济的步骤。
A mild and sequentially Pd/Cu-catalyzed domino synthesis of acidochromic Indolo[3,2-a]carbazoles – Free bases of apocyanine dyes
A sequentially Pd(II)/Cu(II)-catalyzed dimerization of indoles with subsequent oxidative cycloaromatization with alkynes give rise to the formation of strongly violet to blue solution and solid state emissive indolo[3,2-a]carbazoles in a domino fashion under mild conditions and in moderate to good yields. Upon protonation the absorption bands are significantly red-shifted with concomitant quenching
依次用Pd(II)/ Cu(II)催化的吲哚二聚反应,然后用炔烃进行氧化环芳烃化反应,形成强烈的紫色至蓝色溶液,并以多米诺骨牌形式形成固态发光的吲哚[3,2- a ]咔唑在温和的条件下,以中等至良好的产量。质子化后,吸收带显着红移,同时荧光猝灭。质子化的位点通过质子化物种的NMR研究进行仔细检查,并通过DFT计算得到证实。很少描述得到的标题化合物的酸致变色生色团。通过TDDFT计算可以明确分配相关的吸收带。
An efficient synthesis of indolo[3,2-a]carbazoles via the novel acid catalyzed reaction of indoles and diaryl-1,2-diones
作者:Vijay Nair、Vidya Nandialath、Keecherikunnel G. Abhilash、Eringathodi Suresh
DOI:10.1039/b803009j
日期:——
A mild and efficient one pot method for the synthesis of indolo[3,2-a]carbazole derivatives by the para-toluenesulfonic acid catalyzed condensation of indole with acyclic 1,2-diones is described. With cyclobutene-1,2-diones the reaction afforded indole substituted carbazole derivatives in good yield.
Dual activation of CH bonds has enabled the preparation of polycyclic aromatics from arylindoles and arylbenzofurans in the absence of a directing group, and with using O2 as the oxidant (see scheme). Synthetically and medicinally important polycyclic aromatics have been easily prepared, and some of the resulting polycyclic heteroaromatics exhibit intense fluorescence.