Preparation of Enantiopure Ketones and Alcohols Containing a Quaternary Stereocenter through Parallel Kinetic Resolution of β-Keto Nitriles
摘要:
Racemic 1-methyl-2-oxocycloalkanecarbonitriles have been subjected to bioreduction by the fungus Mortierella isabellina NRRL 1757 through a parallel kinetic-resolution process. The u and l alcohols thus obtained (up to >99% ee) were easily separated and oxidized to the R and S ketones, respectively. The process can be then repeated so that both enantiomers of the ketone and two epimers of the alcohol can be obtained in their enantiopure forms.
Diverse Tandem Cyclization Reactions of <i>o</i>-Cyanoanilines and Diaryliodonium Salts with Copper Catalyst for the Construction of Quinazolinimine and Acridine Scaffolds
Two cyclization modes are realized to produce different nitrogen-containing heterocycles, i.e., quinazolin-4(3H)-imines and acridines by assembling o-cyanoanilines and diaryliodonium salts via tandem reaction pathways.
Certain 9-amino-2-(or 4)-oxa 1,2,3,4-tetrahydro- or
申请人:Pfizer Inc.
公开号:US05202440A1
公开(公告)日:1993-04-13
Compounds selected from the group consisting of 9-amino-4-oxa-1,2,3,4-tetrahydro-acridine, 9-amino-2-oxa-1,2,3,4-tetrahydro-acridine, 9-amino-8-fluoro-4-oxa-1,2,3,4-tetrahydro-acridine, 9-amino-4-oxa-1,2,3,4,5,6,7,8-octahydro-acridine or a pharmaceutical acceptable salt thereof are useful treating Alzheimer's disease.
Tin (IV) chloride-promoted reactions of β-dicarbonyl compounds with nitriles. Synthesis of aminopyridines and aminoquinolines.
作者:Augusto C. Veronese、Rosella Callegari、Suada Ahmed Ali Salah
DOI:10.1016/s0040-4039(00)97429-x
日期:1990.1
β-Ketoesters and β-diesters react with β-enaminonitriles in the presence of stoichiometric amounts of tin (IV) chloride to give 4-aminopyridines and pyridones while they react with aromatic orthoaminonitriles to give 4-aminoquinolines and quinolones.
Radical Annulation of 2-Cyanoaryl Acrylamides via C═C Double Bond Cleavage: Access to Amino-Substituted 2-Quinolones
作者:Wen-Jin Xia、Tai-Gang Fan、Zhi-Wei Zhao、Xin Chen、Xiang-Xiang Wang、Ya-Min Li
DOI:10.1021/acs.orglett.1c02281
日期:2021.8.6
2-cyanoaryl acrylamides via C═C double bond cleavage has been developed for facile and efficient access to a broad spectrum of functionalized 4-amino-2-quinolones, which are important N-heterocycles. In this transformation, the solvent THF is demonstrated to play a crucial role, and the addition of alkyl radicals to nitrile, 1,5-hydride shift, and cleavage of the C–C bond are involved in the mechanism
Catalytic Reductive Synthesis and Direct Derivatization of Unprotected Aminoindoles, Aminopyrroles, and Iminoindolines
作者:Leonardus H. Leijendekker、Jens Weweler、Tobias M. Leuther、Jan Streuff
DOI:10.1002/anie.201702310
日期:2017.5.22
A titanium(III)-catalyzed radical cyclization to unprotected 3-aminoindoles, 3-aminopyrroles, or 3-iminoindolines is reported. The reaction is non-hazardous, scalable, and allows facile isolation of the free products by extraction. The method is demonstrated on a large substrate scope and it further allows the direct installation of various nitrogen protecting groups or the synthesis of building blocks