Iron-Catalyzed Oxidative C−C and N−N Coupling of Diarylamines and Synthesis of Spiroacridines
作者:Raphael F. Fritsche、Gabriele Theumer、Olga Kataeva、Hans-Joachim Knölker
DOI:10.1002/anie.201610168
日期:2017.1.9
We describe iron‐catalyzed intermolecular oxidative coupling reactions of diarylamines to form substituted 2,2′‐bis(arylamino)biaryl compounds, tetraarylhydrazines, and 5,6‐dihydrobenzo[c]cinnolines with the same hexadecafluorinated iron–phthalocyanine catalyst. The mild formation of C−C or N−N bonds was controlled by the use of acidic or basic additives. In contrast to most iron‐catalyzed dehydrogenative
我们描述了铁催化的二芳基胺的分子间氧化偶联反应,用相同的十六氟化铁-酞菁催化剂形成取代的2,2'-双(芳基氨基)联芳基化合物,四芳基肼和5,6-二氢苯并[ c ]肉桂啉。通过使用酸性或碱性添加剂,可控制CC或N-N键的温和形成。与大多数铁催化的脱氢偶联反应相反,环境空气可以用作唯一的氧化剂。此外,六水合氯化铁(III)促进了单锅偶合,随后促进了分子内脱芳香性偶合,从而生成10 H-螺[[啶-9,1'-环己2',5'-dien-4'-one]。
First Total Synthesis of the Cytotoxic Carbazole Alkaloid Excavatine-A and Regioselective Annulation to Pyrano[2,3-<i>a</i>]carbazoles and [1,4]Oxazepino[2,3,4-<i>jk</i>]carbazoles
作者:Christian Brütting、Olga Kataeva、Arndt W. Schmidt、Hans-Joachim Knölker
DOI:10.1002/ejoc.201700515
日期:2017.6.16
first totalsynthesis of the cytotoxic carbazolealkaloid excavatine-A. The carbazole framework was constructed through double C–H bond activation of a diarylamine by using our palladium(II)-catalyzed oxidative cyclization. Treatment of the intermediate 8-hydroxycarbazoles with prenal and different additives led either to pyrano[2,3-a]carbazoles or to [1,4]oxazepino[2,3,4-jk]carbazoles. The pyran annulation
我们描述了细胞毒性咔唑生物碱吉伐他汀-A的第一个全合成。咔唑骨架是通过使用我们的钯(II)催化的氧化环化作用,通过对二芳基胺的双CH键进行活化而构建的。用甲醛和其他添加剂处理中间体8-羟基咔唑可生成吡喃并[2,3- a ]咔唑或生成[1,4]恶唑并[2,3,4- jk ]咔唑。研究了吡喃环化,以确定取代方式,添加剂和反应时间对选择性的影响。
Palladium(II)-Catalyzed Synthesis of the Formylcarbazole Alkaloids Murrayaline A-C, 7-Methoxymukonal, and 7-Methoxy-<i>O</i>-methylmukonal
作者:Ronny Hesse、Micha P. Krahl、Anne Jäger、Olga Kataeva、Arndt W. Schmidt、Hans-Joachim Knölker
DOI:10.1002/ejoc.201402201
日期:2014.7
We describe the synthesis of the naturally occurring 2,7-dioxygenated formylcarbazolealkaloids7-methoxymukonal, 7-methoxy-O-methylmukonal, and the murrayalinesA–C. The carbazole framework was constructed by a Buchwald–Hartwig amination and a subsequent palladium(II)-catalyzed oxidative cyclization.
Synthesis of Glycoborine, Glybomine A and B, the Phytoalexin Carbalexin A and the β-Adrenoreceptor Antagonists Carazolol and Carvedilol
作者:Christian Brütting、Ronny Hesse、Anne Jäger、Olga Kataeva、Arndt W. Schmidt、Hans-Joachim Knölker
DOI:10.1002/chem.201604002
日期:2016.11.14
We describe a regioselective synthesis of 4‐ or 5‐substituted carbazoles by oxidative cyclisation of meta‐oxygen‐substituted N‐phenylanilines. Using the regiodirecting effect of a pivaloyloxy group, we prepared 4‐hydroxycarbazole, a precursor for the enantiospecific synthesis of the β‐adrenoreceptor antagonists (−)‐(S)‐carazolol (5) and (−)‐(S)‐carvedilol (6). Regioselective palladium(II)‐catalysed
2,2′‐Bis(arylamino)‐1,1′‐biaryls as Building Blocks for the Synthesis of Dibenzo[<i>d</i>,<i>f</i>][1,3]diazepines, Dibenzo[<i>d</i>,<i>f</i>][1,3]diazepinones, and Dibenzo[<i>c</i>,<i>e</i>][1,2,7]thiadiazepine 6‐Oxides
block: A versatile synthesis of several seven-membered heterocyclic ring systems is described. Key steps of our approach are the iron-catalyzed oxidative C−C homocoupling of diarylamines to 2,2′-bis(arylamino)-1,1′-biaryls and their subsequent condensation with 1,1-dielectrophiles to 6,7-dihydrodibenzo[d,f][1,3]diazepines, 5,7-dihydrodibenzo[d,f][1,3]diazepinones, and 5,7-dihydrodibenzo[c,e][1,2,7]thiadiazepine
一个中心构件:描述了几种七元杂环系统的通用合成。我们方法的关键步骤是二芳基胺与 2,2'-双(芳基氨基)-1,1'-联芳基的铁催化氧化 C−C 自偶联,以及随后与 1,1-二亲电子试剂缩合成 6,7-二氢二苯并[ d , f ][1,3]二氮杂卓类、5,7-二氢二苯并[ d , f ][1,3]二氮杂酮类和 5,7-二氢二苯并[ c , e ][1,2,7]硫杂氮杂卓 6-氧化物。