Enantioselective Synthesis of α-Tertiary Hydroxyaldehydes by Palladium-Catalyzed Asymmetric Allylic Alkylation of Enolates
摘要:
Chiral alpha-tertiary hydroxyaldehydes are very versatile building blocks in synthetic chemistry. Herein, we report the first examples of a catalytic asymmetric protocol for the synthesis of such compounds from readily available alpha-halo or alpha-hydroxy ketones or enol silyl ethers with excellent yields and nantioselectivity. Its synthetic utility is demonstrated in the short, efficient formal synthesis of (S)-oxybutynin. In this process, the chiral ligand controls the regioselectivity as well as the enantioselectivity.
[EN] 1,4-DISUBSTITUTED PYRIDAZINE ANALOGS AND METHODS FOR TREATING SMN-DEFICIENCY-RELATED CONDITIONS<br/>[FR] ANALOGUES DE PYRIDAZINE 1,4-DISUBSTITUÉE ET PROCÉDÉS DE TRAITEMENT DE TROUBLES LIÉS À UNE DÉFICIENCE EN SMN
申请人:NOVARTIS AG
公开号:WO2014028459A1
公开(公告)日:2014-02-20
The present invention provides a compound of formula (I) or a pharmaceutically acceptable salt thereof; a method for manufacturing the compounds of the invention, and its therapeutic uses. The present invention further provides a combination of pharmacologically active agents and a pharmaceutical composition.
Nazarov Reactions Intercepted by (4 + 3) Cycloadditions with Oxygen-Substituted Dienes
作者:François M. LeFort、Vinayak Mishra、Graham D. Dexter、Timothy D. R. Morgan、D. Jean Burnell
DOI:10.1021/acs.joc.5b00914
日期:2015.6.5
The oxyallyl cation intermediate from the Lewisacidmediated Nazarov reaction of an allenyl vinyl ketone was intercepted by acyclic, 2-silyloxy-substituted butadienes by highly regioselective (4 + 3) cycloadditions. Stereoselectivity was often modest, but in some instances steric interactions were responsible for high selectivity. The results are consistent with concerted (4 + 3) cycloadditions. In
[EN] SUBSTITUTED TETRAHYDROPYRANS AND METHOD OF USE<br/>[FR] TÉTRAHYDROPYRANNES SUBSTITUÉS ET MÉTHODE D'UTILISATION ASSOCIÉE
申请人:ABBVIE INC
公开号:WO2016069891A1
公开(公告)日:2016-05-06
Compounds of formula (I) and pharmaceutically acceptable salts or radiolabeled forms thereof, wherein R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12 and m are as defined in the specification, are useful in treating conditions or disorders prevented by or ameliorated by the Cystic Fibrosis Transmembrane Conductance Regulator (CFTR) protein. Methods for making the compounds are described. Also described are pharmaceutical compositions of compounds of formula (I), and methods for using such compounds and compositions.
Versatile Diastereoselectivity in Formal [3,3]-Sigmatropic Shifts of Substituted 1-Alkenyl-3-alkylidenecyclobutanols and Their Silyl Ethers
作者:Michael E. Jung、Nobuko Nishimura、Aaron R. Novack
DOI:10.1021/ja051663p
日期:2005.8.1
A new method for the preparation of highly substituted cyclohexenones is reported. [2 + 2] Cycloaddition of 2-silyloxydienes with allenecarboxylate affords the 1-alkenyl-3-alkylidenecyclobutanol silyl ethers. Thermolysis of these compounds affords the methylene cyclohexenyl silyl ethers with excellent exo selectivity (>95:5) when monosubstituted alkenyl groups are used, while the use of disubstituted
Synthesis of Highly Substituted Cyclohexenes via Mixed Lewis Acid-Catalyzed Diels−Alder Reactions of Highly Substituted Dienes and Dienophiles
作者:Michael E. Jung、David Ho、Hiufung V. Chu
DOI:10.1021/ol050361p
日期:2005.4.14
[reaction: see text] A high-yielding method is described for the rapid synthesis of very hindered cyclohexenes by the Diels-Alderreaction of hindered silyloxy dienes and dienophiles using the mixed Lewis acid catalyst system (AlBr(3)/AlMe(3)). Thus, reaction of the hindered diene 4 with various substituted enones gave good yields of the expected cycloadducts even though both partners are quite sterically