Synthesis of spiro-linked quinolinone-pyrrolidine/pyrrolo[1,2-c]thiazole-oxindole/acenaphthalene hybrids via multi-component [3 + 2] cycloaddition
摘要:
The syntheses of novel spiro-linked quinolinone-pyrrolidine/pyrrolo[1,2-c]thiazole-oxindole/acenaphthalene hybrid heterocycles have been achieved through a one-pot three-component [3 + 2] cycloaddition strategy. The reaction proceeded stereoselectively affording these structurally intriguing multi-spiro compounds in excellent yields. (C) 2018 Elsevier Ltd. All rights reserved.
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.
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.
An unorthodox metal-free synthesis of dihydro-6<i>H</i>-quinoline-5-ones in ethanol/water using a non-nucleophilic base and their cytotoxic studies on human cancer cell line
DBU-catalysed metal-free dominoreaction strategy has been developed for the facilesynthesis of dihydro-6H-quinoline-5-ones. This protocol employs a very expedient route to the synthesis of pyridine frameworks using β-chloro-α,β-unsaturated aldehydes, 1,3-diketones, and ammonium acetate in ethanol : water (1 : 1) solvent under eco-friendly conditions. Diverse types of acyclic and cyclic β-chloro-α,β-unsaturated
Vinyliminophosphorane-mediated preparation of 2-arylquinoline and 4-aryl-1-azaanthraquinone derivatives. X-Ray crystal structure of 1,2-dihydro-3H-indazolo[2,3-a]quinolin-4-one
The reaction of the iminophosphorane derived from 3-azidocyclohexen-2-enone with substituted cinnamyl aldehydes affords 2-aryl-tetrahydroquinoline derivatives, which are easily converted into 2-arylquinolines. By contrast, iminophosphorane derived from 2-azidocyclohex-2-enone reacts only with α,β-unsaturated aldehydes without substituent at β-position to give 5,6-dihydro-8(7H)quinolinones. The iminophosphorane
衍生自3-叠氮基环己烯-2-烯酮的亚氨基膦烷与取代的肉桂醛的反应提供了2-芳基-四氢喹啉衍生物,其易于转化为2-芳基喹啉。相比之下,衍生自2-叠氮基环己-2-烯酮的亚氨基磷烷仅与α,β-不饱和醛反应,在β-位没有取代基,得到5,6-二氢-8(7H)喹啉酮。衍生自2-叠氮基-1,4-萘醌的亚氨基磷烷与取代的肉桂醛反应,直接提供4-芳基-1-氮杂蒽醌。通过X射线分析已解决了1,2-二氢-3 H-吲唑并[2,3 - a ]喹啉-4-酮的晶体和分子结构。
SCHROEDER E.; LEHMANN M.; BOETTCHER I., EUR. J. MED. CHEM.-CHIM. THER., 1979, 14, NO 4, 309-315