Discovery and structure–activity relationships of 2-benzylpyrrolidine-substituted aryloxypropanols as calcium-sensing receptor antagonists
摘要:
A structure-activity relationship study of the amine portion of the calcilytic compound NPS-2143 resulted in the discovery of substituted 2-benzylpyrrolidines as replacements for the 1, 1 -dimethyl-2-naphthalen-2-yl-ethylamine. When compared to NPS-2143, a newly discovered compound, 3h, exhibited similar potency as a calcium-sensing receptor (CaR) antagonist and a superior human ether-a-go-go related gene (hERG) profile. (C) 2004 Elsevier Ltd. All rights reserved.
Deoxofluorination of Aliphatic Carboxylic Acids: A Route to Trifluoromethyl-Substituted Derivatives
作者:Maksym Bugera、Serhii Trofymchuk、Karen Tarasenko、Olga Zaporozhets、Yurii Pustovit、Pavel K. Mykhailiuk
DOI:10.1021/acs.joc.9b02596
日期:2019.12.20
A practical method for the synthesis of functionalized aliphatic trifluoromethyl-substituted derivatives from aliphatic acids is developed. The transformation proceeds with sulfur tetrafluoride in the presence of water as a key additive. Compared to previous methods, the reaction gives products with full retention of stereo- and absolute configuration of chiral centers.
Aryl- and heteroaryl-substituted urea compounds useful in the treatment of diseases and conditions related to DNA damage or lesions in DNA replication are disclosed. Methods of making the compounds, and their use as therapeutic agents, for example, in treating cancer and other diseases characterized by defects in DNA replication, chromosome segregation, or cell division also are disclosed.
Activated Basic Alumina Promotes a Mild, Clean and High-Yield Racemization-Free Synthesis of t-Butyl Esters from Chiral Acid Bromides and t-Butyl Alcohol
作者:Kazuo Nagasawa、Keiko Ohhashi、Asami Yamashita、Keiichi Ito
DOI:10.1246/cl.1994.209
日期:1994.2
Esterification of a variety of acid bromides having even steric bulkiness with t-BuOH/activated basic alumina gave the corresponding t-butylesters in good to excellent yields. In the case of chiral acid bromides, no racemization has been ascertained for the first time.
Use of N-trifluoroacetyl-protected amino acid chlorides in peptide coupling reactions with virtually complete preservation of stereochemistry
作者:Paul A Jass、Victor W Rosso、Saibaba Racha、Nachimuthu Soundararajan、John J Venit、Andrew Rusowicz、Shankar Swaminathan、Julia Livshitz、Edward J Delaney
DOI:10.1016/j.tet.2003.02.002
日期:2003.11
The use of protected amino acid chlorides for peptide coupling reactions has long been avoided due to the extensive racemization that commonly occurs during either the acid chloride formation or the coupling reaction itself. Conditions are described which allow N-trifluoroacetyl-protected amino acid chlorides to be generated in high purity and with high retention of stereochemical integrity. Control
由于在酰基氯的形成或偶联反应本身中通常发生广泛的消旋作用,长期以来一直避免使用受保护的氨基酸氯化物进行肽偶联反应。描述了允许以高纯度和高保留的立体化学完整性产生N-三氟乙酰基保护的氨基酸氯化物的条件。温度控制是控制外消旋作用的主要因素,使用Vilsmeier试剂可方便地在低温下快速形成酰氯。当偶联N时,立体化学完整性得到进一步保持-三氟乙酰基酰氯是在Schotten-Baumann条件下与氨基酸酯一起使用的,具体控制pH值,温度和搅动。偶合的第二级速率常数和与外消旋相关的氮杂内酯形成的速率常数分别测量为4260和3.6 L / mol s。这种高速率差异使反应可以在胺酯最少过量的情况下进行,并使其适合于连续加工。描述了优选的偶联条件对一系列氨基酸偶联的适用性。
Synthesis of a Bicyclic Azetidine with In Vivo Antimalarial Activity Enabled by Stereospecific, Directed C(sp<sup>3</sup>)–H Arylation
作者:Micah Maetani、Jochen Zoller、Bruno Melillo、Oscar Verho、Nobutaka Kato、Jun Pu、Eamon Comer、Stuart L. Schreiber
DOI:10.1021/jacs.7b06994
日期:2017.8.16
The development of new antimalarial therapeutics is necessary to address the increasing resistance to current drugs. Bicyclic azetidines targeting Plasmodium falciparum phenylalanyl-tRNA synthetase comprise one promising new class of antimalarials, especially due to their activities against three stages of the parasite’s life cycle, but a lengthy syntheticroute to these compounds may affect the feasibility