作者:Tobias Haag、Richard A. Hughes、Gerd Ritter、Richard R. Schmidt
DOI:10.1002/ejoc.200700698
日期:2007.12
molecule vascular endothelial growth factor D (VEGF-D). The mimetics were designed to inhibit dimerization of the receptors (VEGFR-2 and VEGFR-3) by VEGF-D, and thus have the potential to inhibit angiogenesis. To this end, in the previously described cyclic octapeptide CNEESLIC and the cyclic nonapeptide CGNEESLIC inhibitors derived from VEGF-D loop 2, the NEES tetrapeptide residue was replaced by a carbohydrate
Reactions of potassium fluoride in glacial acetic acid with chlorocarboxylic acids, amides, and chlorides. The effect of very strong hydrogen bonding on the nucleophilicity of the fluoride anion
作者:James H. Clark、John Emsley
DOI:10.1039/dt9750002129
日期:——
Although KF is very soluble in glacial aceticacid, the nucleophilicity of the fluoride ion therein is much reduced by the verystronghydrogen bonding which occurs between it and the solvent. The fluoride is in effect enhancing the nucleophilicity of the hydroxyl oxygen atom of the carboxylicacid group. Reaction of chlorocarboxylic acids and their derivatives with this reagent produces acetoxy- instead
Imidazo(1,2-a)quinoline derivatives useful as anxiolytic agents
申请人:Synthelabo
公开号:US04675323A1
公开(公告)日:1987-06-23
Compounds which are imidazo[1,2-a]quinoline derivatives of general formula (I) ##STR1## in which X is hydrogen, halogen, (C.sub.1-4)alkyl, (C.sub.1-4)alkoxy, (C.sub.1-4) alkylthio, methylsulphonyl, amino, (C.sub.1-4)alkylamino, di-(C.sub.1-4)alkylamino, nitro or trifluoromethyl, Y is hydrogen, halogen or methyl in position 6, 7 or 8, R.sub.1 and R.sub.2, which may be the same or different, are hydrogen or (C.sub.1-6) alkyl, or R.sub.1 and R.sub.2 together form a tetramethylene, pentamethylene, 3-methyl-3-azapentamethylene, 3-ethoxycarbonyl-3-azapentamethylene group, and A and B both are hydrogen or together form a carbon-carbon bond, and their pharmacologically acceptable acid addition salts have anxiolytic, sleep-inducing, hypnotic, anticonvulsant, analgesic and anti-ulcer properties.
The present invention includes processes for producing 5-hydroxymethyl substituted oxazolidinone alcohols (III) from carbamates (IIA) or a trifluoroacetamide (IIB) using a dihydroxy compound (I) or glycidol (IV) starting material and for the transformation of the hydroxymethyl substituted oxazolidinone alcohols (III) to the corresponding amino compounds, 5-aminomethyl substituted oxazolidinone amines (VII) which are acylated to form commercially useful antibacterial 5-acylamidomethyl substituted oxazolidinone (VIII).
using their vinylogous amides under goldcatalysis to access a wide array of benzo[b]azepines in an atom economical way with excellent functional group compatibility. Deuterium scrambling experiments and DFT studies favor a mechanism involving stabilizing conformational change of the initially formed seven-membered vinyl gold intermediate through a key cyclopropyl gold carbene intermediate and its subsequent
已经提出了一种直接闭环策略,该策略涉及用于合成苯并 [ b ] 氮卓类化合物的o -炔基苯胺衍生物的不太容易进行 7-内切-挖掘碳环化。由于氮的高亲核性,在 o -炔基苯胺衍生物中的微不足道的 5-内切环化已被克服,通过在金催化下使用它们的插烯酰胺来获得广泛的苯并[ b ]]azepines 以原子经济的方式具有出色的官能团相容性。氘加扰实验和 DFT 研究支持一种机制,该机制涉及通过关键的环丙基金卡宾中间体稳定最初形成的七元乙烯基金中间体的构象变化及其随后由抗衡阴离子介导的原脱氧反应。