The synthesis and conformational aspects of a novel dioxopiperazine—a possible β-turn constraint
作者:John S. Davies、Malgosia Stelmach-Diddams、Regis Fromentin、Alun Howells、Ron Cotton
DOI:10.1039/a904943f
日期:——
A synthetic route to a novel α,α-diamino β-keto ethoxycarbonyl-containing dioxopiperazine, capable of mimicking a β-turn, is reported. The cis configuration of the dioxopiperazine has been rationalised by NMR spectroscopy, while computational energy calculations have been used to explain the reluctance to cyclise of N-terminal partially protected dipeptides containing α,α-amino groups.
Hexafluoraceton als Schutzgruppen-und Aktivierungsreagenz in der Aminosäure-und Peptidchemie, 11. Mitt.: Ein neuer präparativ einfacher Zugang zu 2,5-Dioxopiperazinen und 2,5-Dioxomorpholinen
2,5-Dioxopiperazines with symmetrical as well as unsymmetrical substituent pattern can be obtained via 2,2-bis(trifluoromethyl)-1,3-oxazolidin-5-ones, and 2,5-dioxomorpholines via 2,2-bis-(trifluoromethyl)-1,3-dioxolan-4-ones, respectively.
[EN] FUMARATE COMPOUNDS, PHARMACEUTICAL COMPOSITIONS THEREOF, AND METHODS OF USE<br/>[FR] COMPOSÉS FUMARATE, COMPOSITIONS PHARMACEUTIQUES LES CONTENANT ET PROCÉDÉS D'UTILISATION ASSOCIÉS
申请人:NGUYEN MARK QUANG
公开号:WO2016127186A1
公开(公告)日:2016-08-11
Fumarate compounds, pharmaceutical compositions comprising the fumarate compounds, and methods of using fumarate compounds and pharmaceutical compositions for treating neurodegenerative, inflammatory, and autoimmune disorders including multiple sclerosis, psoriasis, irritable bowel disorder, ulcerative colitis, arthritis, chronic obstructive pulmonary disease, asthma, Parkinson's disease, Huntington's disease, and amyotrophic lateral sclerosis are disclosed.
Chiral ligands containing heteroatoms. 11. Optically active 2-hydroxymethyl piperazincs as catalysts in the enantioselective addition of diethylzinc to benzaldehyde
(2R,5S) and (2S,5S)-2-hydroxymethyl-5-alkyl piperazines 1–5 were prepared in good yields without any racemization. The use of these compounds as chiral catalysts for the enantioselectiveaddition of diethylzinc to aldehydes is described. This paper reports the first example of the use of piperazine methanols in asymmetric synthesis.
General and convenient syntheses of optically active 5-alkylpiperazine-2-carboxylic acids are described. The methods are based on cyclization of L- or D-serine with α-amino acids and occur without loss of optical purity. The presented procedures are based on readily available starting materials and can be arranged for multigram quantities.