This invention relates to new tetronic and tetramic acid derivatives with beta-secretase inhibitory activity of formula I:
wherein R
1
, R
2
, R
3
, R
4
, R
5
, R
5′
, R
6
and R
6′
are as defined hereinabove, to processes for their preparation, compositions containing said tetronic and tetramic acid derivatives and their use in the treatment and prevention of diseases modulated by an inhibitor of β-secretase, such as Alzheimer's disease.
Alkylations of chiral amide enolates derived from (ℓ)-prolinol have been shown to yield versatile hydroxy-amides in high diastereomeric purity. Their use in the preparation of optically active carboxylic acids is described.
CERTAIN CHEMICAL ENTITIES, COMPOSITIONS, AND METHODS
申请人:Qian Xiangping
公开号:US20120053162A1
公开(公告)日:2012-03-01
Chemical entities that are bufalin derivatives, pharmaceutical compositions and methods of treatment of cancer are described.
本文描述了一些布法林衍生物的化学实体、制药组合物以及治疗癌症的方法。
N - ( 2 - aryl - propionyl ) - sulfonamides and pharmaceutical preparations containing them
申请人:Dompe S.p.A.
公开号:US20030216392A1
公开(公告)日:2003-11-20
The compounds of formula 1,
1
wherein R and R
2
are as defined in the disclosure, are useful in the prevention and treatment of tissue damage due to exacerbated recruitment of polymorphonuclear neutrophils (PMN leukocytes) at the inflammatory sites.
Synthesis of optically active .ALPHA.-alkyl or .ALPHA.-aryl acids from L-.ALPHA.-amino acids by the use of organocopper reagents.
作者:SHIRO TERASHIMA、CHUNGCHYI TSENG、KENJI KOGA
DOI:10.1248/cpb.27.747
日期:——
With an aim to further explore the utility of L-α-amino acids (I) in the synthesis of optically active compounds, the reaction of optically active α-tosyloxy acids and their derivatives (III) readily obtainable from I, with several types of organocopper reagents were studied. Although there still remain some ambiguity in the formation of unusual reaction products such as the β-keto ester (dl-6) and the vicinal diol ((R)(+)-13) and in lower yields for the substitution products, it has become evident that when optically active α-tosyloxy acids prepared from L-phenylalanine, L-alanine, and L-leucine, respectively, are treated with lithium dialkyl- or diarylcuprates, the substitution reactions can proceed with almost full inversion to give corresponding optically active α-alkyl or α-aryl acids in max. 63% yield.