Enantioselective gem-Chlorofluorination of Active Methylene Compounds Using a Chiral Spiro Oxazoline Ligand
摘要:
Highly enantioselective gem-chlorofluorination of active methylene compounds was carried out by using a copper(II) complex of a chiral spiro pyridyl monooxazoline ligand. This reaction yielded alpha-chloro-alpha-fluoro-beta-keto esters and alpha-chloro-alpha-fluoro-beta-keto phosphonates with up to 92% ee. The resulting dihalo beta-keto ester was converted into various alpha-fluoro-alpha-heteroatom-substituted carbonyl compounds via nucleophilic substitution without loss of optical purity. A fully protected beta-amino acid with a gem-chlorofluoromethylene function was also synthesized.
The pyrazole compound of the present invention is represented by the following general formula (I). The pyrazole compound of the present invention or a salt thereof or a solvate thereof potently inhibits liver glycogen phosphorylase, and, therefore, is useful as a therapeutic or prophylactic agent for diabetes.
wherein each symbol denotes as described in the specifications.
Metal Chelation Aptitudes of Bis(<i>o</i>-azaheteroaryl)methanes As Tuned by Heterocycle Charge Demands<sup>1</sup>
作者:Alessandro Abbotto、Silvia Bradamante、Antonio Facchetti、Giorgio A. Pagani
DOI:10.1021/jo025696o
日期:2002.8.1
benzimidazole, pyridine, and quinoline derivatives. Depending on the structure and electron properties of the ligand, a vast set of neutral chelates ML(2) were obtained, where the ligand is present in its carbanionic form L(-). Additionally, we have prepared salt complexes [M(LH)(n)]X(m), where the ligand is present as a neutral system. Neutral chelates were typically obtained by the reaction of the ligand with
我们描述了许多1,3,azol-2-yl-,1,3-benzazol-2-yl-和基于azinyl的双(o-azazeteroarylaryl)甲烷的合成(LH,L(-)= Het (2)CH(-))及其对二价过渡金属(Zn,Cu,Co,Ni,Hg,Pd)的配位性能。这项广泛的研究包括基于几种取代和/或未取代的噻唑,苯并噻唑,苯并恶唑,苯并咪唑,吡啶和喹啉衍生物的对称和不对称配体。根据配体的结构和电子性质,获得了大量中性螯合物ML(2),其中配体以其碳负离子形式L(-)存在。此外,我们还制备了盐配合物[M(LH)(n)] X(m),其中配体以中性系统存在。中性螯合物通常是通过配体与金属乙酸盐在酒精溶液中的反应获得的。盐配合物是通过与其他金属盐(如氯化物)反应而形成的。通过基于可变的π电子结构和取代模式的杂芳族化合物探索几种二杂芳基甲烷配体的配位性质,我们证明中性螯合物的形成严格取决于杂芳族
Amides of pyrrole- and thiophene-fused anthraquinone derivatives: A role of the heterocyclic core in antitumor properties
作者:Alexander S. Tikhomirov、Valeria A. Litvinova、Daria V. Andreeva、Vladimir B. Tsvetkov、Lyubov G. Dezhenkova、Yulia L. Volodina、Dmitry N. Kaluzhny、Ivan D. Treshalin、Dominique Schols、Alla A. Ramonova、Mikhail M. Moisenovich、Alexander A. Shtil、Andrey E. Shchekotikhin
DOI:10.1016/j.ejmech.2020.112294
日期:2020.8
Heteroarene-fused anthraquinonederivatives represent a class of perspective anticancer drug candidates capable of targeting multiple vital processes including drug resistance. Taking advantage of previously demonstrated potential of amide derivatives of heteroarene-fused anthraquinones, we herein dissected the role of the heterocyclic core in antitumor properties. A new series of naphtho[2,3-f]indole-3-
Cooperative Palladium/Brønsted Acid Catalysis toward the Highly Enantioselective Allenylation of β-Keto Esters
作者:Henning J. Loui、Christoph Schneider
DOI:10.1021/acs.orglett.2c00179
日期:2022.2.25
We report the first enantioselective allenylation of Pd enolates enabled by cooperative Pd/Brønsted acid catalysis employing β-keto esters and propargyl alcohols. The enantioselectivity originates solely from an in-situ-generated chiral metal enolate in an open transition state with no additional binding of the propargyl component to the catalyst. Thus a broad substrate scope was established, furnishing
[EN] NAPHTHOFURAN DERIVATIVES, PREPARATION, AND METHODS OF USE THEREOF<br/>[FR] DÉRIVÉS DE NAPHTHOFURANE, PRÉPARATION ET PROCÉDÉS D'UTILISATION ASSOCIÉS
申请人:BOSTON BIOMEDICAL INC
公开号:WO2018102427A1
公开(公告)日:2018-06-07
Provided herein are methods of preparation of I by reacting i with acid where R1 and R2 are each independently a leaving group. Intermediates to make i are also claimed.