76569-43-2Relevant articles and documents
Synthesis of 4-Quinolones: N,O-Bis(trimethylsilyl)acetamide-Mediated Cyclization with Cleavage of Aromatic C-O Bond
Pí?a, Ond?ej,Rádl, Stanislav
, p. 2336 - 2350 (2016/05/19)
The synthesis of 1,4-dihydro-4-oxoquinoline derivatives (4-quinolones) based on a BSA [N,O-bis(trimethylsilyl)acetamide]-mediated cyclization of substituted 1-(2-methoxyphenyl)-3-(alkyl/arylamino)prop-2-en-1-ones is described. The reaction belongs to a rare set of cyclizations in which a methoxy group serves as the leaving group. Reaction takes place by the action of silylating agent under mild conditions and provides high yields of pure products following simple aqueous work-up. The versatility of the approach is exemplified by a wide range of 1-alkyl/aryl 3-carboxylates and 3-nitriles that have been prepared. A crucial advantage of this approach is the facile availability of starting methoxy compounds enabling new synthetic possibilities as well as improved cost efficiency. A new approach to the synthesis of 1,4-dihydro-4-oxoquinoline (4-quinolone) derivatives using a BSA-mediated reaction was developed; this entails an example of rare cyclizations in which an OMe group serves as a leaving group. This transformation has great synthetic potential due to the phenolic framework of starting materials and the mildness of the reagent.
Thienopyridine or thienopyrimidine derivatives and their use
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, (2008/06/13)
This invention provides an anti-inflammatory agent, particularly an agent for treating arthritis, and a bone resorption inhibiting agent, containing a thienopyridine or thienopyrimidine derivative or a salt thereof. This invention also provides a novel th