Attempts to Use Cyanide Ion to Trap Imine Intermediates in the Microsomal N-Dealkylation of Propranolol: Formation of α-Aminonitriles as Artifacts When Using Ether for Extraction
作者:H. Umesha Shetty、Wendel L. Nelson
DOI:10.1002/jps.2600740912
日期:1985.9
Cyanide anion was used to attempt to trap possible imine intermediates in the oxidative N-dealkylation of propranolol (1). Reaction of 3-(1-naphthoxy)-1-amino-2-propanol (desisopropylpropranolol, 2) with acetone provided this expected intermediate in an approximately 7:1 ratio of oxazolidine 6 to imine 5, as determined by 1H NMR. The mixture when treated with sodium cyanide gave the expected alpha-aminonitrile
氰化物阴离子用于尝试在普萘洛尔(1)的氧化N-脱烷基反应中捕获可能的亚胺中间体。3-(1-萘氧基)-1-氨基-2-丙醇(去异丙基普萘洛尔,2)与丙酮的反应提供了该预期的中间体,通过1H NMR测定,该中间体的恶唑烷6与亚胺5的比例约为7:1。该混合物用氰化钠处理后,得到了预期的α-氨基腈7。在氰化钠存在下,普萘洛尔的微粒体氧化得到了两种含氰化物的加合物,如GC-MS(12a和12b)所示。使用专门的氘代普萘洛尔(8、9、10和11)作为底物,表明这两个含氰化物的加合物都失去了N-异丙基。化合物12a和12b被证明是2与丙醛反应生成的非对映异构体α-氨基腈,来自用于萃取的醚和氰化物阴离子的污染物。可靠的7号化合物,对衍生化和GC-MS条件稳定,在代谢实验条件下会迅速分解。