Nonquaternary cholinesterase reactivators. Dialkylaminoalkyl thioesters of .alpha.-ketothiohydroximic acids as reactivators of diisopropyl phosphorofluoridate-inhibited acetylcholinesterase
作者:Richard A. Kenley、Robert A. Howd、Carol W. Mosher、John S. Winterle
DOI:10.1021/jm00142a003
日期:1981.10
acid thioesters and evaluated them in vitro with respect to their ability to reactivate (diisopropylphosphoryl)acetylcholinesterase. The compounds conform to the general formula RC(=O)C(=NOH)S(CH2)nNR2'.HCl, where R = CH3, C6H5, 4-CH3OC6H4, 4-NO2C6H4; n = 2, 3; and R' = CH3, C2H5, or i-C3h7. We also prepared 4-BrC6H4C(=NOH)S(CH2)2N(C2H5)2.HCl and 4-CH3OC6H4C(=O)C(=NOH)S(CH2)2N(C2H5)2.CH3I for comparison
我们已经制备了一系列的α-酮硫代氢肟酸硫酯,并在体外评估了它们重新活化(二异丙基磷酰基)乙酰胆碱酯酶的能力。所述化合物符合通式RC(= O)C(= NOH)S(CH 2)n NR 2'.HCl,其中R = CH 3,C 6 H 5,4-CH 3 OC 6 H 4,4-NO 2 C 6 H 4。n = 2、3;并且R'= CH3,C2H5或i-C3h7。我们还制备了4-BrC6H4C(= NOH)S(CH2)2N(C2H5)2.HCl和4-CH3OC6H4C(= O)C(= NOH)S(CH2)2N(C2H5)2.CH3I进行比较。α-酮硫代氢氧酸酯的肟酸解离常数(pKa)在6.9至8.4范围内,pKa = 7.9,被认为是乙酰胆碱酯酶重新活化的最佳选择。这些化合物也是良好的亲核试剂。与对硝基苯乙酸酯反应的双分子速率常数(kn)遵循表达式log(kn)= 6.7-0。在25°C,pH 7.6、1