Aminoguanidine hydrazone derivatives, process for producing the same and drugs thereof
申请人:Takeda Chemical Industries, Ltd.
公开号:US06350749B1
公开(公告)日:2002-02-26
The present invention is to provide a compound of the formula:
wherein the ring A is an optionally substituted 5- to 6-membered aromatic heterocyclic ring, the ring B an optionally substituted 5- to 6-membered aromatic homocyclic ring or an optionally substituted 5- to 6-membered aromatic heterocyclic ring, R1 is a hydrogen atom, a hydroxy group or a lower alkyl group, and n is 0 or 1, or a salt thereof, which is effective for the prevention or treatment of ischemic cardiac disease, etc., and which is useful as an agent for preventing or treating ischemic cardiac disease, etc. such as myocardial infarction, arrhythmia, etc.
Cinchona Squaramide‐Catalyzed Intermolecular Desymmetrization of 1,3‐Diketones Leading to Chiral 1,4‐Dihydropyridines
作者:Maciej Dajek、Agnieszka Pruszczyńska、Krzysztof A. Konieczny、Rafał Kowalczyk
DOI:10.1002/adsc.202000455
日期:2020.9.8
Addition of prochiral cyclic 1,3‐diketones to Michael acceptors applying bifunctional Cinchona‐derived squaramides resulted in chiral adducts with stereoselectivities of up to 99% ee and allowed for desymmetrization of the nucleophile. These labile hemiacetal intermediates were transformed to new 1,4‐dihydropyridines with high diastereoselectivities and no erosion of optical purity. Their further oxidation
A simple and convenient protocol for the synthesis of benzo[c]chromen-6-ones and 3-substitutedisocoumarins through a CuI-catalyzed tandemreaction of 2-bromobenzoates withcyclohexane-1,3-diones or acyclic 1,3-diones is developed. This strategy can also be extended to the one-pot synthesis of isoquinolin-1(2H)-one and 3,4-dihydrophenanthridine-1,6(2H,5H)-dione.
Selective synthesis of polyfunctionalized hydroisoquinoline derivatives via a three-component domino reaction
作者:Juan-Juan Zhang、Jun-Die Hu、Cheng-Pao Cao、Guo-Lan Dou、Lei Fu、Zhi-Bin Huang、Da-Qing Shi
DOI:10.1039/c4ra12560f
日期:——
Two series of novel polyfunctionalized hydroisoquinoline derivatives have been synthesized via a three-component domino reaction of glutaraldehyde, malononitrile and 1,3-dicarbonyl compounds under microwave irradiation conditions in the presence of a catalytic amount of NaOH (10 mol%). Notably, this one-pot transformation allowed for the formation of six or seven new bonds and three new rings depending