Concurrent esterification and N-acetylation of amino acids with orthoesters: a useful reaction with interesting mechanistic implications
摘要:
The concurrent esterification and N-acetylation of amino acids has been studied with triethyl orthoacetate (TEOA) and triethyl orthoformate (TEOF). In a surprising finding, only 1 equiv of TEOA in refluxing toluene was necessary to convert L-proline and L-phenylalanine into the corresponding N-acetyl ethyl esters in good yield. The same transformation using TEOF was not effective. Stereochemical outcome and stoichiometric studies as well as structural variation of the amino acids in this reaction provided unexpected mechanistic insight. (C) 2010 Elsevier Ltd. All rights reserved.
PYRAZOLE COMPOUNDS FOR TREATMENT OF NEURODEGENERATIVE DISORDERS
申请人:Chen L. Yuhpyng
公开号:US20070270474A1
公开(公告)日:2007-11-22
The invention provides compounds of Formula I:
wherein R
1
, R
2
, R
3
, R
4
, R
6
, R
7
, R
8
and A are as defined. Compounds of formula I have activity inhibiting production of Aβ-peptide. The invention also provides pharmaceutical compositions and methods for treating diseases, for example Alzheimer's disease, in mammals comprising compounds of Formula I.
Novel Indolin-2-one Derivatives, Their Preparation and the Pharmaceutical Compositions Comprising Them
申请人:FOULON Loic
公开号:US20070203184A1
公开(公告)日:2007-08-30
The present invention relates to novel indolin-2-one derivatives of formula:
to the preparation and to the pharmaceutical compositions comprising them. These compounds have an affinity for oxytocin receptors.