3-苯基异恶唑并[2,3- a ]嘧啶衍生物的亲核开环中的立体选择性和区域选择性。不可预料的二聚化和环转化。嘧啶基甲胺,嘧啶基甲基氨基酸酰胺和α-氨基-2-嘧啶基乙酰胺的衍生物的合成1
摘要:
光学活性氨基酸酰胺和麻黄碱在2-氧代-3-苯基异恶唑啉[2,3- a ]嘧啶衍生物中异恶唑酮环的亲核开环导致嘧啶基甲基氨基酸酰胺。的不同使用酰胺升-氨基酸和( - ) -麻黄碱导致不同程度的立体选择性的。选择性的程度主要取决于所使用的亲核试剂。当使用羟胺如麻黄碱时,发现通过仲氨基的进攻是有利的区域选择性。取代苯基异恶唑[2,3- a]中位置2的氧代基团后通过亚氨基形成]嘧啶体系,预期不会发生开环后的自发脱羧反应,从而获得了2-嘧啶基乙酰胺的氨基酸酰胺衍生物,该衍生物与嘧啶溴酸(博来霉素的重要成分)密切相关,用于癌症治疗。然而,通过在溶液中加热5,7-二甲基-2-亚氨基-3-苯基异恶唑并[2,3- a ]嘧啶,它经历了前所未有的二聚反应过程,该过程涉及苯基和亚氨基。通过乙酰化保护亚氨基后,亲核试剂可能会开环,导致形成2-嘧啶基乙酰胺的衍生物。2-乙酰氨基-5,7-二甲基-3-苯基异恶唑[2,3-
Distress and disease status among patients with rheumatoid arthritis: Roles of coping styles and perceived responses from support providers
摘要:
Previous research has shown that social support can have a beneficial impact on coping processes and psychological adjustment in patients with rheumatoid arthritis (RA). The association of individual coping styles and perceived responses from others to one's pain episodes with patients' distress and disease status over time was investigated. The sample consisted of 42 middle-aged patients with RA who were predominantly White (98%), female (64%), and married (88%). Participants completed surveys and their rheumatologist completed clinical assessments of patient disease status at 2 time points over a 9-month period Although punishing responses from others (e.g, getting irritated or angry when the patient is in pain) were perceived as relatively infrequent, they were associated with a patient coping style of focusing on and venting of negative emotion as well as elevated negative affect (NA). Findings also indicated that those who perceived punishing responses from close others and coped by venting negative emotions reported increased NA over time and were rated by their rheumatologist as having more severe RA disease status over time. Implications for psychosocial intervention and directions for future research are discussed.
Biocatalytic hydrolysis of various anilides containing l-phenylalanine using Baker's yeast proceeded efficiently without sucrose under neutral conditions to afford the corresponding aniline derivatives in 26–60% yields.
An Efficient Light‐Mediated Protocol for the Direct Amide Bond Formation via a Novel Carboxylic Acid Photoactivation Mode by Pyridine‐CBr<sub>4</sub>
作者:Olga G. Mountanea、Danai Psathopoulou、Christiana Mantzourani、Maroula G. Kokotou、E. Alexandros Routsi、Demeter Tzeli、Christoforos G. Kokotos、George Kokotos
DOI:10.1002/chem.202300556
日期:2023.6.22
A UVA-light-mediated synthesis of amides from carboxylic acids and amines or amino acids is presented, taking advantage of a novel photoactivation mode using pyridine-CBr4. Mechanistic studies by DI-HRMS provide experimental evidence for the formation of various intermediates. Application in the synthesis of industrially interesting or bioactive compounds was demonstrated.
Verfahren zur Herstellung von Carbonsäureamidgruppen enthaltenden Verbindungen, insbesondere von Peptiden
申请人:HOECHST AKTIENGESELLSCHAFT
公开号:EP0135183A2
公开(公告)日:1985-03-27
Die Erfindung betrifft ein Verfahren zur Herstellung von Carbonsäureamidgruppen enthaltenden Verbindungen, insbesondere Peptiden durch Umsetzung von Verbindungen, die eine Carboxylgruppe enthalten, in Gegenwart von Dialkylphosphinsäureanhydriden mit Verbindungen, die eine freie Aminogruppe enthalten, das dadurch gekennzeichnet ist, daß man die Wasserstoffionenkonzentration der Reaktionsmischung durch Zudosierung einer Base während der Reaktion innerhalb eines definierten Bereiches hält und nach beendeter Reaktion gegebenenfalls zum Schutz anderer funktioneller Gruppen eingeführte Reste abspaltet.
Amidation of carboxylic acids via the mixed carbonic carboxylic anhydrides and its application to synthesis of antidepressant (1 S ,2 R )-tranylcypromine
Primary amidations of carboxylic acids 1 or 3 with NH4Cl in the presence of ClCO2Et and Et3N were developed to afford the corresponding primary amides in 22% to quantitative yields. Additionally, we have applied the amidation to the preparation of various amides containing hydroxamic acids and achieved the synthesis of (1S,2R)-tranylcypromine as an antidepressant medicine via Lossen rearrangement. (C) 2017 Elsevier Ltd. All rights reserved.
Distress and disease status among patients with rheumatoid arthritis: Roles of coping styles and perceived responses from support providers
作者:Kenneth W. Griffin、Ronald Friend、Alan T. Kaell、Ronald S. Bennett
DOI:10.1207/s15324796abm2302_8
日期:2001.5
Previous research has shown that social support can have a beneficial impact on coping processes and psychological adjustment in patients with rheumatoid arthritis (RA). The association of individual coping styles and perceived responses from others to one's pain episodes with patients' distress and disease status over time was investigated. The sample consisted of 42 middle-aged patients with RA who were predominantly White (98%), female (64%), and married (88%). Participants completed surveys and their rheumatologist completed clinical assessments of patient disease status at 2 time points over a 9-month period Although punishing responses from others (e.g, getting irritated or angry when the patient is in pain) were perceived as relatively infrequent, they were associated with a patient coping style of focusing on and venting of negative emotion as well as elevated negative affect (NA). Findings also indicated that those who perceived punishing responses from close others and coped by venting negative emotions reported increased NA over time and were rated by their rheumatologist as having more severe RA disease status over time. Implications for psychosocial intervention and directions for future research are discussed.