Cytochrome P-450 complex formation in the metabolism of phenylalkylamines. 8. Stereoselectivity in metabolic intermediary complex formation with a series of chiral 2-substituted 1-phenyl-2-aminoethanes
作者:Ulla B. Paulsen-Soerman、Karl Henrik Joensson、Bjoern G. A. Lindeke
DOI:10.1021/jm00369a018
日期:1984.3
between log Vmax(obsd) and the logarithm of the octanol/buffer partition coefficient of the substrates. With increasing lipophilicity, the S-(+) enantiomers became more active than the R-(-) isomers in generating the complex. The rates of complex formation for the faster S-(+) enantiomers coincided with those of the previously investigated racemates, indicating that the R-(-) enantiomers do not act as competitive
在苯巴比妥预处理的肝微粒体中减少的烟酰胺腺嘌呤二核苷酸磷酸(NADPH)依赖性代谢过程中,研究了由四种2-烷基取代的1-苯基-2-氨基乙烷的对映异构体形成的细胞色素P-450代谢中间物(MI)复合物的形成。大鼠。2-烷基取代基是甲基(苯异丙胺),乙基,正丙基和正丁基。通过不对称的氢解转氨作用,由相应的烷基苄基酮制备手性胺。圆二色性分析表明,所有胺均具有S-(+)和R-(-)构型。配合物形成的最大速度(Vmax(obsd))随着烷基尺寸的增加而增加,对于每个系列的对映异构体,log Vmax(obsd)与底物的辛醇/缓冲液分配系数的对数之间都具有良好的相关性。随着亲脂性的增加,S-(+)对映异构体在生成复合物中比R-(-)异构体更具活性。较快的S-(+)对映异构体形成复合物的速率与先前研究的外消旋体的速率一致,这表明R-(-)对映异构体在大鼠肝脏制剂中不作为竞争性酶抑制剂。与先前的两项研究一