In one aspect, the invention relates to compounds having the formula I:
where R
1
-R
6
are as defined in the specification, or a pharmaceutically acceptable salt thereof. These compounds have neprilysin inhibition activity. In another aspect, the invention relates to pharmaceutical compositions comprising these compounds; methods of using these compounds; and processes and intermediates for preparing these compounds.
Absolute Configurational Assignments of Secondary Amines by CD-Sensitive Dimeric Zinc Porphyrin Host
作者:Xuefei Huang、Naoko Fujioka、Gennaro Pescitelli、Frank E. Koehn、R. Thomas Williamson、Koji Nakanishi、Nina Berova
DOI:10.1021/ja020520p
日期:2002.9.1
determination of absoluteconfiguration of secondary amines including acyclic and cyclic aliphatic amines, aromatic amines, aminoacids, and amino alcohols is described. The chiral substrate is linked to the achiral carrier moiety (3-N-Boc-amino-propyl-N-Boc-amino)acetic acid 1 (BocHNCH(2)CH(2)CH(2)BocNCH(2)COOH), which after deprotection, yields a bidentate conjugate, capable of forming a 1:1 host/guest complex
描述了用于确定仲胺绝对构型的一般手性实验方案,包括无环和环状脂肪胺、芳香胺、氨基酸和氨基醇。手性底物连接到非手性载体部分(3-N-Boc-氨基-丙基-N-Boc-氨基)乙酸1(BocHNCH(2)CH(2)CH(2)BocNCH(2)COOH),脱保护后,产生双齿缀合物,能够与二聚锌卟啉宿主 2 形成 1:1 的宿主/客体复合物。与早先报道的伯胺和仲醇的情况一样,仲胺缀合物与卟啉镊子宿主的络合图2表示立体分化过程,其中立体中心的大(L)基团(基于构象能A值指定)从卟啉结合口袋突出。这导致形成具有优选的卟啉螺旋的宿主/客体复合物,表现出强烈的激子分裂 CD 光谱。尽管仲胺偶联物的叔酰胺键周围的 Z/E 构象复杂性极大地阻碍了先前的构型分配,但发现卟啉扭曲的手性意义明显受立体中心控制。因此,在取代基的相对空间大小没有歧义的情况下,观察到的 CD 对可以用于直接分配绝对构型。此外,为了将应用扩展
HIV protease inhibitors
申请人:Wong Chi-Huey
公开号:US06900238B1
公开(公告)日:2005-05-31
Combinatorial libraries of HIV and FIV protease inhibitors are characterized by α-keto amide or hydroxyethylamine core structures flanked by on one side by substituted pyrrolidines, piperidines, or azasugars and on the other side by phenylalanine, tyrosine, or substituted tyrosines. The libraries are synthesized via a one step coupling reaction. Highly efficacious drug candidates are identified by screening the libraries for binding and inhibitory activity against both HIV and FIV protease. Drug candidates displaying clinically useful activity against both HIV and FIV protease are identified as being potentially resistive against a loss of inhibitory activity due to development of resistant strains of HIV.
Chiral Lewis Base-Catalyzed, Enantioselective Reduction of Unprotected β-Enamino Esters with Trichlorosilane
作者:Jianheng Ye、Chao Wang、Lin Chen、Xinjun Wu、Li Zhou、Jian Sun
DOI:10.1002/adsc.201501061
日期:2016.3.31
reduction of N‐unsubstituted β‐enamino esters represents a major challenge for asymmetric catalysis. In this paper, the first organocatalytic system that could be used for the asymmetric hydrosilylation of N‐unsubstituted β‐enamino esters has been developed. Using N‐tert‐butylsulfinyl‐L‐proline‐derived amides and L‐pipecolinic acid‐derived formamides as catalyst, a broad range of β‐aryl‐ and β‐alkyl‐substituted