Ligand‐Enabled β‐C–H Arylation of α‐Amino Acids Without Installing Exogenous Directing Groups
作者:Gang Chen、Zhe Zhuang、Gen‐Cheng Li、Tyler G. Saint‐Denis、Yi Hsiao、Candice L. Joe、Jin‐Quan Yu
DOI:10.1002/anie.201610580
日期:2017.2
Herein we report acid‐directed β‐C(sp3)‐Harylation of α‐amino acids enabled by pyridine‐type ligands. This reaction does not require the installation of an exogenous directinggroup, is scalable, and enables the preparation of Fmoc‐protected unnatural amino acids in three steps. The pyridine‐type ligands are crucial for the development of this new C(sp3)‐Harylation.
AN ALDOL-TYPE REACTION OF ACTIVE METHYL GROUPS OF NITROGEN-CONTAINING HETEROAROMATIC COMPOUNDS
作者:Hiroshi Hamana、Tsutomu Sugasawa
DOI:10.1246/cl.1983.333
日期:1983.3.5
Active methyl groups of nitrogen-containing heteroaromatic compounds react with benzaldehydes in the presence of 9-BBN triflate and diisopropylethylamine in dichloromethane to give the corresponding aldol-type products under mild conditions.
Direct reversible decarboxylation from stable organic acids in dimethylformamide solution
作者:Duanyang Kong、Patrick J. Moon、Erica K. J. Lui、Odey Bsharat、Rylan J. Lundgren
DOI:10.1126/science.abb4129
日期:2020.7.31
chemically stable C(sp3) carboxylates, such as arylacetic acids and malonate half-esters, undergo uncatalyzed reversible decarboxylation in dimethylformamide solution. Decarboxylation-carboxylation occurs with substrates resistant to protodecarboxylation by Brønsted acids under otherwise identical conditions. Isotopically labeled carboxylic acids can be prepared in high chemical and isotopic yield by
CO2 的简单交换 羧酸中的二氧化碳 (CO2) 损失是生化和合成环境中的常见反应,但它通常涉及催化或长时间加热。孔等人。现在报告某些极性溶剂,如二甲基甲酰胺,它们本身会促进可逆的 CO2 损失,这些都是由一个碳桥接到芳环的羧酸盐。由于环上有吸电子取代基,即使在室温下,同位素标记的 CO2 也可以有效交换。或者,与醛的反应导致醇的形成。科学,这个问题 p。557 某些极性溶剂在令人惊讶的温和条件下使结合在苄基位点的 CO2 变得不稳定。有机化学中的许多经典和新兴方法依赖于二氧化碳 (CO2) 挤出来生成用于成键事件的反应中间体。涉及微观逆向的合成反应 - 反应中间体的羧化 - 通常使用非常不同的条件进行。我们报告化学稳定的 C(sp3) 羧酸盐,如芳基乙酸和丙二酸半酯,在二甲基甲酰胺溶液中经历未催化的可逆脱羧。脱羧 - 羧化发生在底物上,在其他条件相同的情况下,对布朗斯台德酸的原脱羧作用有
Novel Heterocyclic Substituted Carbonyl Derivatives and Their Use as Dopamine D3 Receptor Ligands
申请人:Hendrix James A.
公开号:US20090247509A1
公开(公告)日:2009-10-01
The invention relates to heterocyclic substituted carbonyl derivatives that display selective binding to dopamine D
3
receptors. In another aspect, the invention relates to a method for treating central nervous system disorders associated with the dopamine D
3
receptor activity in a patient in need of such treatment comprising administering to the subject a therapeutically effective amount of said compounds for alleviation of such disorder. The central nervous system disorders that may be treated with these compounds include Psychotic Disorders, Substance Dependence, Substance Abuse, Dyskinetic Disorders (e.g. Parkinson's Disease, Parkinsonism, Neuroleptic-Induced Tardive Dyskinesia, Gilles de la Tourette Syndrome and Huntington's Disease), Dementia, Anxiety Disorders, Sleep Disorders, Circadian Rhythm Disorders and Mood Disorders. The subject invention is also directed towards processes for the preparation of the compounds described herein as well as methods for making and using the compounds as imaging agents for dopamine D
3
receptors.
Novel heterocyclic amide derivatives and their use as dopamine D3 receptor ligands
申请人:Hendrix A. James
公开号:US20070142351A1
公开(公告)日:2007-06-21
The invention relates to heterocyclic substituted amide derivatives that display selective binding to dopamine D
3
receptors. In another aspect, the invention relates to a method for treating central nervous system disorders associated with the dopamine D
3
receptor activity in a patient in need of such treatment comprising administering to the subject a therapeutically effective amount of said compounds for alleviation of such disorder. The central nervous system disorders that may be treated with these compounds include Psychotic Disorders, Substance Dependence, Substance Abuse, Dyskinetic Disorders (e.g. Parkinson's Disease, Parkinsonism, Neuroleptic-Induced Tardive Dyskinesia, Gilles de la Tourette Syndrome and Huntington's Disease), Dementia, Anxiety Disorders, Sleep Disorders, Circadian Rhythm Disorders and Mood Disorders. The subject invention is also directed towards processes for the preparation of the compounds described herein as well as methods for making and using the compounds as imaging agents for dopamine D
3
receptors.