A Diazonium Ion Cascade from the Nitrosation of Tolazoline, An Imidazoline-Containing Drug
作者:Richard N. Loeppky、Jianzheng Shi、Charles L. Barnes、Sailaja Geddam
DOI:10.1021/tx700317g
日期:2008.2.1
ng drug, reacts readily with nitrite in acetic acid to produce a complex product mixture. Fourteen compounds have been identified as products of this transformation when an 8-fold excess of HNO2 is used. The products, which include N-nitrosoamides, esters, alcohols, and phenylacetic acid, are rationalized as arising from a cascade of reactive diazonium ions. N-Nitrosotolazoline can be isolated from
托拉唑啉(1-苄基咪唑啉)是一种代表性的含咪唑啉的药物,在乙酸中容易与亚硝酸盐反应生成复杂的产物混合物。当使用8倍过量的HNO2时,已鉴定出14种化合物是该转化的产物。包括N-亚硝基酰胺,酯,醇和苯乙酸在内的产品被合理化为由一系列反应性重氮离子产生。当随着转化的进行用CH 2 Cl 2萃取混合物时,可以以高收率从亚硝化反应中分离出N-亚硝基偶氮唑啉。它比托拉唑啉的亚硝化速度快得多(50x),从而得到肟[1-(N-亚硝基-2-咪唑啉基)亚苄基]羟胺,该化合物也可以通过托拉唑啉与异丙基的反应以高收率生产。亚硝酸盐。在低底物和亚硝酸盐浓度下,主要反应产物为N-亚硝基偶氮唑啉,其分解产物N-2-羟乙基苯基乙酰胺,上述肟,苯基乙酸和2-羟乙基苯基乙酸酯。在pH 3.4和37摄氏度下测定了三种缓冲液系统中托拉唑啉的亚硝化率(在0.5 M乙酸盐缓冲液中使用10 * [NO2(-)] = 250时,kobs