2-(4-R-Phenoxy/phenylthio)alkanoic esters of l-lupinine
摘要:
Considering the great pharmacological interest in phenoxy/phenylthioalkanoic esters of open-chain or cyclic aminoalcohols, a set of ten such esters of lupinine was prepared. Initially, their ability to displace [H-3]QNB from rat brain preparation was investigated. With the exception of two, all the prepared esters exhibited good affinity to muscarinic receptors (on a non-selective basis), with pK(i) in the range 6.67-7.68. (C) 2001 Elsevier Science S.A. All rights reserved.
leads ((R)-(+)-hyoscyamine and (p-chlorophenyl)propionic acid alpha-tropanyl ester), which show analgesic and nootropic activities as a consequence of increased central presynaptic ACh release, are reported. 2-Phenoxy- and 2-(phenylthio)alkanoic acid esters showed the best results. Several members of these classes possess analgesic properties which are comparable to that of morphine and at the same time
Preparation of 3-alkyl .beta.-lactams via the ketene imine cycloaddition reaction using .alpha.-(phenylthio)alkanoyl halides as starting materials: application to the synthesis of (.+-.)-carbapenem building blocks and related compounds
作者:Claudio Palomo、Fernando P. Cossio、Jose M. Odiozola、Mikel Oiarbide、Jesus M. Ontoria
DOI:10.1021/jo00014a017
日期:1991.7
Preparation of appropriately substituted 3-alkyl beta-lactams via the ketene (or equivalent)-imine cycloaddition reaction is described. The dehydrochlorination reaction of alpha-(phenylthio)alkanoyl chlorides with triethylamine in the presence of imines derived from cinnamaldehydes and p-anisidine produced a high-yield formation of alpha-phenylthio beta-lactams, which upon desulfuration furnished a variety of 3-alkyl beta-lactams in a highly stereoselective fashion. In contrast, reaction between alpha-haloalkanoyl chlorides and cinnamylideneamines in the presence of triethylamine furnished the corresponding [4 + 2] cycloadducts as main products. Preparation of highly functionalized alpha-alkylidene beta-lactams through thermal decomposition of the corresponding beta-lactam sulfoxides or by cycloaddition of alpha,beta-unsaturated acid chlorides to imino esters in the presence of triethylamine is also described. Addition of Flemming's silylcuprate reagent to alpha-alkylidene beta-lactams furnished the corresponding 3-(1'-(dimethylphenylsilyl(ethyl) beta-lactams as (+/-)-thienamycin intermediates.
PALOMO, CLAUDIO;COSSIO, FERNANDO P.;ODIZOLA, JOSE M.;OIARBIDE, MIKEL;ONTO+, J. ORG. CHEM., 56,(1991) N4, C. 4418-4428
作者:PALOMO, CLAUDIO、COSSIO, FERNANDO P.、ODIZOLA, JOSE M.、OIARBIDE, MIKEL、ONTO+
DOI:——
日期:——
2-(4-R-Phenoxy/phenylthio)alkanoic esters of l-lupinine
作者:Anna Sparatore、Fabio Sparatore
DOI:10.1016/s0014-827x(01)01036-9
日期:2001.4
Considering the great pharmacological interest in phenoxy/phenylthioalkanoic esters of open-chain or cyclic aminoalcohols, a set of ten such esters of lupinine was prepared. Initially, their ability to displace [H-3]QNB from rat brain preparation was investigated. With the exception of two, all the prepared esters exhibited good affinity to muscarinic receptors (on a non-selective basis), with pK(i) in the range 6.67-7.68. (C) 2001 Elsevier Science S.A. All rights reserved.
Complete assignment of1H and13C NMR spectra of some α-arylthio and α-arylsulfonyl substituted N-methoxy-N-methyl propionamides
作者:Nelson L. C. Domingues、Mirta G. Mondino、Adriana K. C. A. Reis、Roberto Rittner、Filipe S. Lima、Paulo R. Olivato