Simplified procedures for the Ir-catalyzed asymmetric allylicalkylation reaction are described that often allow substitution products to be obtained with ≥99% ee. Applications to syntheses of important chiral building blocks, such as the Taniguchi lactone and dimethyl 2-vinylcyclopropane-1,1 -dicarboxylate, are presented.
描述了 Ir 催化的不对称烯丙基烷基化反应的简化程序,通常允许获得≥99% ee 的取代产物。介绍了重要手性构件的合成应用,如谷口内酯和 2-乙烯基环丙烷-1,1-二羧酸二甲酯。
Highly Stereoselective Radical Cyclization of Haloacetals Controlled by the Acetal Center
A systematic investigation of radical haloacetal cyclizations (Ueno-Stork reaction) where the acetal center is the unique stereogenic element is reported. This highly diastereoselective reaction can be used for the preparation of polysubstituted tetrahydrofurans and gamma-lactones. We report herein the full experimental details of reactions where up to three new chiral centers are created. To demonstrate
[EN] NON-STEROIDAL GLUCOCORTICOID RECEPTOR MODULATORS FOR LOCAL DRUG DELIVERY<br/>[FR] MODULATEURS DES RÉCEPTEURS GLUCOCORTICOÏDES NON STÉROÏDIENS POUR ADMINISTRATION LOCALE DE MÉDICAMENTS
申请人:LEO PHARMA AS
公开号:WO2017046096A1
公开(公告)日:2017-03-23
The present invention relates to a compound according to formula (I) wherein R1 is selected from the group consisting of 5- and 6- membered heteroaryl, (C1- C6)alkyl, (C3-C6)cycloalkyl, (4-6)-membered heterocycloalkyl and phenyl; R2 is selected from (C1-C3)alkyl and halo(C1-C3)alkyl; R3 is selected from phenyl, 5-membered heteroaryl and 6-membered heteroaryl; R4 is selected from hydrogen, halogen, (C1- C4)alkyl and halo(C1-C4)alkyl; X1 is selected from CH, C(Rb) and N, X2 is selected from CH and N; Y is selected from -NH- and -O-; m is 0 or 1; n is 0 or 1; L represents a bond, -O-, -NH- or -N(RC)-; or pharmaceutically acceptable salts, hydrates, or solvates thereof. The invention relates further to intermediates for the preparation of said compounds, to said compounds for use in therapy, to pharmaceutical compositions comprising said compounds, to methods of treating diseases with said compounds, and to the use of said compounds in the manufacture of medicaments.
Scalable Total Synthesis of (−)-Triptonide: Serendipitous Discovery of a Visible-Light-Promoted Olefin Coupling Initiated by Metal-Catalyzed Hydrogen Atom Transfer (MHAT)
作者:Xianhe Fang、Nan Zhang、Si-Cong Chen、Tuoping Luo
DOI:10.1021/jacs.1c12525
日期:2022.2.9
An efficient and scalable total synthesis of (−)-triptonide is accomplished based on a metal-catalyzed hydrogenatom transfer (MHAT)-initiated radical cyclization. During the optimization of the key step, we discovered that blue LEDs significantly promoted the efficiency of reaction initiated by Co(TPP)-catalyzed MHAT. Further exploration and optimization of this catalytic system led to development