Facile Diversity-Oriented Synthesis and Antitubercular Evaluation of Novel Aryl and Heteroaryl Tethered Pyridines and Dihydro-6<i>H</i>-quinolin-5-ones Derived via Variants of the Bohlmann–Rahtz Reaction
nes tethered with aryls and heteroaryls was achieved in very good yields through CeCl3·7H2O-NaI catalyst via variants of the Bohlmann–Rahtz reaction. β-Enaminones derived from various aryl and heteroaryl methyl ketones were regioselectively reacted with ethyl acetoacetate or 5,5-dimethylcyclohexane-1,3-dione or 4,4-dimethylcyclohexane-1,3-dione and ammonium acetate refluxing in 2-propanol. Applicability
Described herein is an efficient protocol for the site selective oxidative CâH activation/acetoxylation of a series of 2-aryl/heteroaryl/thiophenyl tethered dihydroquinolinones using palladium acetate as the catalyst and iodobenzene diacetate as an oxidant. All these transformations progressed well at less sterically encumbered and electronically favourable CâH bonds to give corresponding ortho-acetoxylated derivatives in good yields. Further, acetoxylation of thiophenyl embedded dihydroquinolinones resulted in single regioisomers, acetoxylated at the C-2 position on the thiophenyl moiety. However, when the C-2 position on the thiophene unit was blocked, the acetoxy group was exclusively installed at the C-4 position. Further, we noticed that acetoxylation of dihydroquinolin-5(6H)-one-oxime did not alter ligand preferentiality to give the ortho-acetoxylated product.
Microwave-assisted regioselective one-pot synthesis of trisubstituted pyridine scaffolds using K<sub>5</sub>CoW<sub>12</sub>O<sub>40</sub>.3H<sub>2</sub>O under solvent free conditions
作者:Srinivas Kantevari、Mahankhali Venu Chary、Srinivasu V. N. Vuppalapati、N. Lingaiah
DOI:10.1002/jhet.5570450424
日期:2008.7
A highly efficient, microwave-assisted, regioselectivesynthesis of 2,3-disubstituted-6-arylpyridines and new series of 7,7-dimethyl-2-aryl-5,6,7,8-tetrahydroquinoline-5-ones from enaminones in the presence of K5CoW12O40.3H2O (1.0 mol %) as heterogeneous catalyst undersolventfreeconditions is reported.
高效的微波辅助区域选择性合成的2,3-二取代的6-芳基吡啶和新的7,7-二甲基2-芳基5,6,7,8-四氢喹啉5-酮从氨基酮中合成。据报道在无溶剂条件下存在K 5 CoW 12 O 40 .3H 2 O(1.0 mol%)作为非均相催化剂。
Novel 5,6,7,8-tetrahydro-5-quinolines and their use as anti-inflammatory
申请人:Schering, A.G.
公开号:US04117135A1
公开(公告)日:1978-09-26
Pyridine derivatives of the formula ##STR1## wherein R.sub.1 is an alkyl, aliphatic, a cycloalkyl, or a substituted or unsubstituted hydrocarbon aryl and the substituent is halogen, alkoxy or methylenedioxy; R.sub.2 is H or Cl; X is CN, 5-tetrazolyl, or COOH or a carboxylic acid derivative; Y is H, OH, OCOR.sub.7, NH.sub.2, NHCOR.sub.8, R.sub.9, COOH or COOR.sub.10 and R.sub.7, R.sub.8, R.sub.9 and R.sub.10 are alkyl groups of 1-10 carbon atoms; A is methylene or a carbon-to-carbon bond; and R.sub.3 and R.sub.4 are each H or alkyl groups of 1-4 carbon atoms, are useful as anti-inflammatory agents.
Domino synthesis of functionalized pyridine carboxylates under gallium catalysis: Unravelling the reaction pathway and the role of the nitrogen source counter anion
作者:Dinesh Kumar、Himanshu Sharma、Nirjhar Saha、Asit K. Chakraborti
DOI:10.1002/asia.202200304
日期:2022.8
domino Michael-cyclodehydration-aromatization multicomponent reaction for the synthesis of functionalized pyridines from enaminones, 1,3-diketones, and NH4OAc undersolvent-freecondition is reported. The method is simple, high-yielding, and operates under mild conditions with a wide substrate scope. The use of different ammonium salts as a nitrogen source was investigated and the decisive role of the acetate
报道了在无溶剂条件下由烯胺酮、1,3-二酮和 NH 4 OAc 合成官能化吡啶的 GaI 3催化多米诺迈克尔环脱水芳构化多组分反应。该方法简单、收率高、操作条件温和、底物范围广。研究了使用不同的铵盐作为氮源,并确定了醋酸盐抗衡阴离子的决定性作用。