Enantioselective Arylation of 2-Methylacetoacetates Catalyzed by CuI/trans-4-Hydroxy-l-proline at Low Reaction Temperatures
摘要:
CuI/trans-4-hydroxy-l-proline-catalyzed coupling reaction of 2-iodotrifluoroacetanilides with 2-methylacetoacetates took place at -45 degrees C to create alpha-aryl all-carbon quaternary centers enantioselectively. Up to 93% ee was achieved when tert-butyl ester was used. The combination of ligand, ortho substituent (participation of NHCOCF3), and solvent effects was shown to account for these unprecedentedly mild reaction conditions.
Preparation of cruciferous phytoalexin related metabolites, (−)-dioxibrassinin and (−)-3-cyanomethyl-3-hydroxyoxindole, and determination of their absolute configurations by vibrational circular dichroism (VCD)
作者:Kenji Monde、Tohru Taniguchi、Nobuaki Miura、Shin-Ichiro Nishimura、Nobuyuki Harada、Rina K Dukor、Laurence A Nafie
DOI:10.1016/s0040-4039(03)01513-2
日期:2003.8
metabolites, (−)-dioxibrassinin (1) and (−)-3-cyanomethyl-3-hydroxyoxindole (2) were prepared from isatin as racemates and were resolved by chiral HPLC. Their absoluteconfigurations were determined by the new chiroptical technique, vibrationalcirculardichroism (VCD), as well as by the conventional electronic circulardichroism (ECD). It is concluded that the absoluteconfigurations of the naturally
[EN] NOVEL COMPOUNDS USEFUL AS POLY(ADP-RIBOSE) POLYMERASE (PARP) INHIBITORS<br/>[FR] NOUVEAUX COMPOSÉS UTILES EN TANT QU'INHIBITEURS DE LA POLY(ADP-RIBOSE) POLYMÉRASE (PARP)
申请人:RHIZEN PHARMACEUTICALS AG
公开号:WO2021220120A1
公开(公告)日:2021-11-04
The present invention provides novel poly(ADP-ribose) polymerase (PARP) inhibitors, methods of preparing them, pharmaceutical compositions containing them and methods for the treatment, prevention and/or amelioration of PARP mediated diseases or disorders using them. In particular, the compounds described herein are useful for the treatment of carcinoma of the breast, ovarian cancer, carcinoma of the liver, carcinoma of the lung, small cell lung cancer, esophageal cancer, gall bladder cancer, pancreatic cancer and stomach cancer.
A Facile Pathway to Enantiomerically Enriched 3-Hydroxy-2-Oxindoles: Asymmetric Intramolecular Arylation of α-Keto Amides Catalyzed by a Palladium-DifluorPhos Complex
作者:Liang Yin、Motomu Kanai、Masakatsu Shibasaki
DOI:10.1002/anie.201102158
日期:2011.8.8
Less metal wastes: The first catalytic, enantioselective intramolecular aryl‐transfer reaction of aryl triflates to ketones has been developed (see scheme; R1=R2=aromatic and aliphatic). This method features overall practicality, including substrate stability and accessibility (protecting‐group free) plus no need for the use of stoichiometric amounts of metals.
减少金属废料:已开发出芳基三氟甲磺酸酯向酮的第一个催化,对映选择性分子内芳基转移反应(参见方案; R 1 = R 2 =芳族和脂族)。该方法具有整体实用性,包括基材稳定性和可及性(无保护基团),而且无需使用化学计量的金属。
Facile and Efficient Enantioselective Hydroxyamination Reaction: Synthesis of 3-Hydroxyamino-2-Oxindoles Using Nitrosoarenes
Sc takes action: The highly enantioselectivehydroxyaminationreaction of N‐unprotected 2‐oxindoles with nitrosoarenes has been realized using the Sc(OTf)3/L1 complex. The catalyst system exhibited remarkably broad substrate scope and high efficiency. This transformation is the first example of a chiral ScIII/enolate activating a nitrosoarene, and can be conducted on a gram scale without loss in the
Sc发挥作用:使用Sc(OTf)3 / L1络合物实现了N-未保护的2-氧吲哚与亚硝基芳烃的高度对映选择性羟基胺化反应。该催化剂体系表现出显着的底物范围和高效率。该转化是手性Sc III /烯酸酯活化亚硝基芳烃的第一个实例,并且可以以克级进行,而不会损失ee 值。
Synthesis of a C-N Axially Chiral<i>N</i>-Arylisatin through Asymmetric Intramolecular<i>N</i>-Arylation
We describe the first synthesis of an enantiomerically pure C–Naxially chiral N-arylisatin from the corresponding N-aryloxindole, which was synthesized by an asymmetric intramolecular Buchwald–Hartwig N-arylation. This novel isatin would be a potentially versatile synthetic intermediate for a variety of 3,3-disubstituted oxindoles bearing a C3 stereogenic center.