Protocols for the Syntheses of 2,2′-Bis(indolyl)arylmethanes, 2-Benzylated Indoles, and 5,7-Dihydroindolo[2,3-<i>b</i>]carbazoles
作者:Ferruh Lafzi、Haydar Kilic、Nurullah Saracoglu
DOI:10.1021/acs.joc.9b02124
日期:2019.9.20
The electrophilic substitution reaction of 4,7-dihydroindole with aryl-aldehydes as an electrophilic partner followed by an oxidation step to deliver 2,2′-bis(indolyl)arylmethanes was studied for the first time. The reaction afforded regioselectivity at the 2,2′-positions of indole in an operationally simple and inexpensive procedure with a variety of substrates. To the best of our knowledge, this
首次研究了4,7-二氢吲哚与芳基醛作为亲电伙伴的亲电取代反应,然后进行氧化步骤以生成2,2'-双(吲哚基)芳基甲烷。该反应在操作简单且廉价的过程中使用多种底物在吲哚的2,2'-位提供了区域选择性。据我们所知,这是以无取代基方式获得的2,2'-双(吲哚基)芳基甲烷的第一组实例。还报道了一种从二吡咯甲烷到相应的2-苄基吲哚的简便方法。另外,将2,2'-双(吲哚基)芳基甲烷转化为5,7-二氢吲哚并[2,3- b ]咔唑。
Organocatalytic Enantioselective Friedel−Crafts Alkylation of 4,7-Dihydroindoles with α,β-Unsaturated Aldehydes: An Easy Access to 2-Substituted Indoles
作者:Liang Hong、Chunxia Liu、Wangsheng Sun、Lei Wang、Kwokyin Wong、Rui Wang
DOI:10.1021/ol900461v
日期:2009.5.21
An enantioselectiveFriedel−Craftsalkylation of 4,7-dihydroindoles and α,β-unsaturated aldehydes has been developed. The process is promoted by diphenylprolinol ether to afford 2-substituted 4,7-dihydroindoles in high yields and enantioselectivities. After a subsequent oxidation of the products, the optically active 2-substituted indoles could be obtained smoothly in high yields without any loss of
Synthesis of New 2-Vinylation Products of Indole via a Michael-Type Addition Reaction with Dimethyl Acetylenedicarboxylate and Their Diels−Alder Reactivity as Precursors of New Carbazoles
作者:Hüseyin Çavdar、Nurullah Saraçoǧlu
DOI:10.1021/jo061336f
日期:2006.9.1
Reaction of 4,7-dihydroindole and dimethylacetylenedicarboxylate provided a convenient route to functionalized 2-vinylindoles. Diels−Alder reactions of the 2-vinylindoles with naphthoquinone, p-benzoquinone, 1,2-dicyano-4,5-dichloroquinone, N-phenyltriazolinedione, and tetracyanoethylene were investigated to give [c]annelated 1,2-dihydro, 1,2,3,4-tetrahydro, and fully aromatized carbazoles. The structure
4,7-二氢吲哚与乙酰二羧酸二甲酯的反应为官能化的2-乙烯基吲哚提供了一条方便的途径。研究了2-乙烯基吲哚与萘醌,对苯醌,1,2-二氰基-4,5-二氯醌,N-苯基三唑啉二酮和四氰基乙烯的狄尔斯-阿尔德反应,得到[ c ]退火的1,2-二氢,1 2,3,4-四氢和完全芳香化的咔唑。讨论了2-乙烯基吲哚及其环加合物的结构和形成机理。
Enantio- and periselective nitroalkene Diels–Alder reaction
作者:Maurice J. Narcis、Daniel J. Sprague、Burjor Captain、Norito Takenaka
DOI:10.1039/c2ob26674a
日期:——
The periselective DielsâAlder reaction of 5-substituted pentamethylcyclopentadienes and nitroethylene has been realized by helicalâchiral hydrogen bond donor catalysts. To our knowledge, this represents the first asymmetric catalytic nitroalkene DielsâAlder reaction via activation of nitroalkene, and thus establishes its proof-of-principle.
Chiral Brønsted acid catalyzed asymmetric Friedel–Crafts alkylation reaction of indoles with α,β-unsaturated ketones: short access to optically active 2- and 3-substituted indole derivatives
The asymmetric Friedel–Crafts alkylation reaction of indoles with α,β-unsaturated ketones catalyzed by chiral phosphoric acid is reported. A wide range of indoles and 4,7-dihydroindoles were allowed to react with α,β-unsaturated ketones to give the corresponding 1,4-adducts in good to high chemical yields and with excellent enantioselectivities.