Asymmetrically induced alkylation of 2-benzyl-4-isopropyl-2,4-dihydro-1H-pyrazino[2,1-b]quinazoline-3,6-dione
摘要:
The substitution of the 4-methyl group by a 4-isopropyl group in the 2-benzyl-2,4-dihydro-1H-pyrazino[2,1-b]quinazoline-3,6-dione system allows a notable improvement in the stereoselective alkylation at C-I. The configuration of the newly introduced stereogenic centre has been assigned on the basis of H-1 NMR data and NOE measurements. (C) 1998 Elsevier Science Ltd. All rights reserved.
Structure–Activity Relationship Studies on Oxazolo[3,4-<i>a</i>]pyrazine Derivatives Leading to the Discovery of a Novel Neuropeptide S Receptor Antagonist with Potent <i>In Vivo</i> Activity
urgent need for new effective therapeutic approaches. Potent NPSR antagonists in vitro have been discovered which, however, require further optimization of their in vivo pharmacological profile. This work describes a new series of NPSR antagonists of the oxazolo[3,4-a]pyrazine class. The guanidine derivative 16 exhibited nanomolar activity in vitro and 5-fold improved potency in vivo compared to SHA-68,
Neuropeptide S 通过与其 G 蛋白偶联受体(称为神经肽 S 受体 (NPSR))相互作用来调节重要的神经生物学功能,包括运动、焦虑和药物滥用。 NPSR 拮抗剂可潜在用于治疗药物滥用疾病,迫切需要新的有效治疗方法。体外有效的 NPSR 拮抗剂已被发现,然而,需要进一步优化其体内药理学特性。这项工作描述了恶唑并[3,4- a ]吡嗪类的一系列新 NPSR 拮抗剂。与该领域的参考药理学工具SHA-68相比,胍衍生物16在体外表现出纳摩尔级活性,在体内效力提高了 5 倍。化合物16可以被认为是研究 NPSergic 系统转化潜力的新工具。还进行了深入的分子建模研究,以获得对观察到的结构-活性关系的新见解,并提供配体/NPSR相互作用的更新模型。
Highly efficient enantioselective synthesis of 1,3-disubstituted 2,5-diketopiperazine derivatives via microwave irradiation
作者:Si Yeon Han、Young-Dae Gong
DOI:10.1080/00397911.2019.1671983
日期:2019.12.17
Abstract Chiral 2,5-diketopiperazine (2,5-DKP) derivatives have a broad range of biological activities in the medicinal field. The synthetic protocols of 1,3-disubstituted 2,5-DKPs via base-catalyzed cyclization of chloroacetamide have been reported. However, there are several drawbacks, such as an overly long reaction time, low to moderate yield, and racemization of the products. The sequence modified
A compound of the formula (I):
a pharmaceutically acceptable salt or solvate thereof,
wherein
Ring Q is optionally substituted monocyclic aryl, optionally substituted monocyclic heteroaryl, optionally substituted fused aryl or optionally substituted fused heteroaryl,
Y
1
is a bond or —NR
6
— or the like,
Ring A is optionally substituted nonaromatic heterocyclediyl,
a group of the formula: -Y
2
Z
1
- is a group of the formula:
R
7
are each independently hydrogen, optionally substituted lower alkyl or the like,
R
8
and R
9
are each independently hydrogen or optionally substituted lower alkyl,
n is an integer between 1 and 3,
Z
1
is a bond, —O—, —S— or —NR
9
—,
Ring B is optionally substituted aromatic carbocyclediyl or optionally substituted aromatic heterocyclediyl,
Y
3
is a bond, optionally substituted lower alkylene optionally intervened by —O—, optionally substituted lower alkenylene or the like, and
Z
2
is COOR
3
or the like.
Benzofurylpiperazines and benzofurylhomopiperazines: serotonin agonists
申请人:Briner Karin
公开号:US06967201B1
公开(公告)日:2005-11-22
The present invention provides serotonergic benzofurylpiperazines of Formula I:
where:
A is a piperazine of formula:
and R, R
1
, R
2
, R
3
, R
4
, R
5
, R
5′
, R
6
, R
6′
, R
7
, R
7′
, R
8
, and R
8′
are as described in the specification.
Phenoxyacetic Acid Derivatives Useful for Treating Respiratory Diseases
申请人:Alcaraz Lilian
公开号:US20090149448A1
公开(公告)日:2009-06-11
The invention relates to substituted phenoxyacetic acids as useful pharmaceutical compounds for treating respiratory disorders, pharmaceutical compositions containing them, and processes for their preparation.