合成了一系列新的30种对称双吡啶鎓和相关的N-杂芳族双季铵盐与丙烷-1,3-二基连接基,并表征了它们在加利福尼亚鱼雷的烟碱乙酰胆碱受体(nAChR)MB327结合位点的结合亲和力。靶向此结合位点的化合物对于研究针对有机磷酸酯中毒的新型解毒剂特别感兴趣,因为其具有治疗活性,可被4-叔丁基取代的双吡啶鎓盐MB327以前被鉴定为nAChR再敏化剂。通过新开发的方法可以有效地获得目标化合物,该方法可以使具有多种官能团的空间受阻或电子失活的杂环进行N烷基化。使用最近开发的基于质谱(MS)的结合测定法测定对nAChR处MB327结合位点的结合亲和力,结果表明几种化合物的亲和力与MB327相似(p K i = 4.73±0.03)。值得注意的是,发现新制备的亲脂性4-叔丁基-3-苯基取代的双吡啶鎓盐PTM0022(3 h)具有明显更高的结合亲和力,p Ki值为5.16±0.07,代表在开发更有效的nAChR再敏化剂方面取得了可观的进步。
Amidine Dications: Isolation and [Fe]-Hydrogenase-Related Hydrogenation
作者:Michael J. Corr、Kirsty F. Gibson、Alan R. Kennedy、John A. Murphy
DOI:10.1021/ja9035847
日期:2009.7.8
This commmunication demonstrates the preparation, isolation, and full characterization of superelectrophilic salts based on amidinedications in organic solvent, as their triflate salts. These dications are highly activated toward regiospecific reaction with hydrogen gas under mild conditions in the presence of a metal catalyst (Pd/C), mimicking the behavior of the natural substrate, N5,N10-methen
作者:Michael J. Corr、Mark D. Roydhouse、Kirsty F. Gibson、Sheng-ze Zhou、Alan R. Kennedy、John A. Murphy
DOI:10.1021/ja908191k
日期:2009.12.16
2-Dimethylalkylammonium pyridinium and 2-dimethylalkylammonium pyrimidinium ditriflate salts are very powerful methylating agents toward phosphorus (triphenylphosphine) and nitrogen (triethylamine) nucleophiles. In competition experiments with triethylamine as nucleophile, these N-methyl disalts are more reactive methylating agents than dimethyl sulfate. Reaction of the pyridinium dications with water as an oxygen nucleophile
A One-Pot Preparation of 1,3-Disubstituted Azetidines
作者:Michael C. Hillier、Cheng-yi Chen
DOI:10.1021/jo061147x
日期:2006.9.1
A straightforward synthesis of 1,3-disubstituted azetidines has been accomplished via the alkylation of a primary amine with the bis-triflate of a 2-substituted-1,3-propanediol species. This transformation is carried out in one reaction vessel, and elimination of the alkylating reagent is generally not a major byproduct. The scope of this methodology has been investigated using a variety 2-substituted-1
作者:Benjamin J. Coe、John Fielden、Simon P. Foxon、James A. Harris、Madeleine Helliwell、Bruce S. Brunschwig、Inge Asselberghs、Koen Clays、Javier Garín、Jesús Orduna
DOI:10.1021/ja103289a
日期:2010.8.4
optical (NLO) responses with reversible redox chemistry. The chromophores have been characterized as their PF(6)(-) salts by using various techniques including electronicabsorption spectroscopy and cyclic voltammetry. Their visible absorptionspectra are dominated by intense pi --> pi* intramolecular charge-transfer (ICT) bands, and all show two reversible diquat-based reductions. First hyperpolarizabilities