Synthesis and Intramolecular Azo Coupling of 4-Diazopyrrole-2-carboxylates: Selective Approach to Benzo and Hetero [<i>c</i>]-Fused 6<i>H</i>-Pyrrolo[3,4-<i>c</i>]pyridazine-5-carboxylates
作者:Ekaterina E. Galenko、Alexey V. Galenko、Alexander F. Khlebnikov、Mikhail S. Novikov、Julia R. Shakirova
DOI:10.1021/acs.joc.6b01662
日期:2016.9.16
of fluorescent benzo, thieno, and furo [c]-fused methyl 7-aryl-6H-pyrrolo[3,4-c]pyridazine-5-carboxylates, including unprecedented heterocyclic skeletons, was performed by the transformation of methyl 4-aminopyrrole-2-carboxylate into the corresponding diazo compound, followed by intramolecular azo coupling under acid conditions onto a nucleophilic aryl or hetaryl group in the 3-position. Azo coupling
荧光苯并,噻吩并与呋喃并[ c ]稠合的甲基7-芳基-6 H-吡咯并[3,4- c ]哒嗪-5-羧酸酯的合成,包括空前的杂环骨架,都可以通过高转化率合成将4-氨基吡咯-2-羧酸甲酯合成相应的重氮化合物,然后在酸性条件下将分子内偶氮偶合到3-位的亲核芳基或杂芳基上。偶氮偶联是完全区域选择性的,并且根据DFT计算,是动力学控制的反应。1,3-二取代的2 H-吡咯并[3,4- c ] cinnolines的N-甲基化在动力学控制下在N5选择性地发生,仅导致5-methyl-5 H-pyrrolo [3,4- c ] cinnoline衍生物。
作者:Wen-Ting Meng、Yan Zheng、Jing Nie、Heng-Ying Xiong、Jun-An Ma
DOI:10.1021/jo302419e
日期:2013.1.18
A facile one-pot sequential conjugate addition/dearomative fluorination transformation of isoxazol-5(4H)-ones with nitroolefins and N-fluorobenzenesulfonimide (NFSI) has been developed. By using a bifunctional chiral tertiary amino-thiourea catalyst, a series of chiral fluorinated isoxazol-5(4H)-ones containing one fluorine-substituted quarternary stereocenter were obtained in high yields with high
enantioselective C‐allylations of isoxazolinones. These occur with high regioselectivity in favor of the linear allylation products, although Ir phosphoramidite catalysts were used, which commonly results in branched isomers. Our studies suggest that this outcome is the result of a reaction cascade via an initial regio‐ and enantioselective N‐allylation to provide a branched allyl intermediate, followed
3-Aryl-4-(2-thienylmethylene)isoxazol-5(4H)-ones as Fungicides
申请人:HALLENBACH Werner
公开号:US20120100989A1
公开(公告)日:2012-04-26
The invention relates to 3-aryl-4-(2-thienylmethylene)isoxazol-5(4H)-ones, to agrochemically active salts thereof, to their use and to methods and compositions for controlling phytopathogenic harmful fungi and insects in and/or on plants or in and/or on seed of plants, to processes for preparing such compositions and to treated seed, and to their use for controlling phytopathogenic harmful fungi in agriculture, horticulture and forestry, in animal health, in the protection of materials and in the domestic and hygiene field. The present invention further relates to a process for preparing isoxazolone derivatives.
1-(2<i>H</i>-Azirine-2-carbonyl)benzotriazoles: building blocks for the synthesis of pyrrole-containing heterocycles
作者:Ekaterina E. Galenko、Firuza M. Shakirova、Vladimir A. Bodunov、Mikhail S. Novikov、Alexander F. Khlebnikov
DOI:10.1039/d0ob00206b
日期:——
to good yields. Base-promoted annulations of 2-((benzotriazol-1-yl)carbonyl)pyrroles with aldehydes, ketones, isocyanates and isothiocyanates afford various substituted pyrrolo[1,2-c]oxazole and 1H-pyrrolo[1,2-c]imidazole derivatives in moderate to high yields. The 6-acyl group of these adducts can be removed by triflic acid, giving further new pyrrolo-fused O- and N-heterocycles, such as 6-unsubstituted
开发了一种一锅法制备2 H - azirine-2-羰基苯并三唑,该方法是通过苯并三唑与2 H -azirine-2-羰基氯的反应形成的,该反应是由Fe(II)催化的苯甲酰异构化生成的。 5-氯异恶唑。2 H-叠氮基-2-羰基苯并三唑与1,3-二酮的Co(II)催化反应以中等到良好的产率提供了2-(((苯并三唑-1-基)羰基)吡咯。碱促进的2-(((苯并三唑-1-基)羰基)吡咯与醛,酮,异氰酸酯和异硫氰酸酯的碱环合反应提供各种取代的吡咯并[1,2- c ]恶唑和1 H-吡咯并[1,2- c]咪唑衍生物,中等至高收率。这些加合物的6-酰基可被三氟甲磺酸除去,得到进一步的新的吡咯并稠合的O-和N-杂环,如6-未取代的吡咯并[1,2 - c ]恶唑-1(3 H)-和1 H-吡咯并[1,2- c ]咪唑-1,3(2 H)-二酮,而1 H-吡咯并[1,2- c ]咪唑-1,3(2 H当用POCl 3