Stereoselective synthesis of 5-alkyliden-6-aminotetrahydro-2-pyranones through an unexpected isomerization of the hydroxytetrahydro-2-pyridinones obtained by the selective reduction of acylated enaminones
摘要:
A convenient methodology for the stereoselective preparation of 5-alkyliden-6-aminotetrahydro-2-pyranone 4 is reported. The synthesis of 2-pyranone 4 occurs through an unknown isomerization mechanism of the hydroxytetrahydro-2-pyridinone 3, an accessible starling material obtained by mild and selective reduction of the 5-acyltetrahydro-2-pyridinone 2. The isomerization mechanism and the stereoselectivity in the synthesis of 2-pyranone 4 was investigated and rationalized. (C) 1997 Elsevier Science Ltd. All rights reserved.
Stereoselective synthesis of 5-alkyliden-6-aminotetrahydro-2-pyranones through an unexpected isomerization of the hydroxytetrahydro-2-pyridinones obtained by the selective reduction of acylated enaminones
摘要:
A convenient methodology for the stereoselective preparation of 5-alkyliden-6-aminotetrahydro-2-pyranone 4 is reported. The synthesis of 2-pyranone 4 occurs through an unknown isomerization mechanism of the hydroxytetrahydro-2-pyridinone 3, an accessible starling material obtained by mild and selective reduction of the 5-acyltetrahydro-2-pyridinone 2. The isomerization mechanism and the stereoselectivity in the synthesis of 2-pyranone 4 was investigated and rationalized. (C) 1997 Elsevier Science Ltd. All rights reserved.
3,4-Dihydrocarbostyril derivatives and process for producing the same
申请人:OtsukaPharmaceutical Co., Ltd.
公开号:US04256890A1
公开(公告)日:1981-03-17
Novel compounds represented by the formula ##STR1## wherein R.sup.1, R.sup.2, and R' and R" are defined as hereinafter, having a blocking activity on .beta.-adrenergic nerves, novel intermediates useful for synthesis thereof and processes for preparing the same are disclosed. When substitution is at the 5-position and R.sup.1 and R.sup.2 are hydrogen, R' and R" are not simultaneously hydrogen and a 1 to 4 carbon atom alkyl group in the claimed compound.
Verwendung von Chinolin-2,5-dionen in einem Arzneimittel mit einer analgetischen, antipyretischen und/oder einer antiphlogistischen Wirkung
申请人:Dr. Karl Thomae GmbH
公开号:EP0338228A2
公开(公告)日:1989-10-25
Die vorliegende Erfindung betrifft Arzneimittel, enthaltend Chinolin-2,5-dione der Formel
in der
A, B, R₁ bis R₃ und X wie in den Ansprüchen 1 bis 6 definiert sind, sowie neue Chinolin-2,5-dione gemäß den Ansprüchen 10 bis 14, welche wertvolle pharmakologische Eigenschaften aufweisen, insbesondere eine analgetische, antipyretische und/oder antiphlogistische Wirkung, neue Zwischenprodukte und Verfahren zu ihrer Herstellung.