2-Methylpapaverinium iodide (I), 2'-hydroxymethyl-2-methylpapaverinium iodide (IX), and 2-methyl-3,4-dihydropapaverinium iodide (X. CH3I) form pseudobase by addition of hydroxide ions to the C(1)=N(+) bond. 2'-Hydroxymethyl-2-methyl-3,4-dihydropapaverinium iodide (XV) and 2'-hydroxymethyl-2-methyl-9-oxo-3,4-dihydropapaverinium iodide (XVI) react with hydroxide ions in aqueous medium under formation of cyclic pseudobases XVII and XVIII. The equilibrium constants (KR+) of pseudobase formation have been measured in aqueous ethanol (1 : 1 w/w, 25°C, ionic strength 0.1). The quaternary papaverinium derivatives are metabolized to isoquinilones and carbonyl compounds by means of rat liver enzymes. The role of pseudobases in these biotransformations has been discussed and biogenetic conclusions have been drawn.
2-甲基罂粟碱碘化物(I),2'-羟甲基-2-甲基罂粟碱碘化物(IX),和2-甲基-3,4-二氢罂粟碱碘化物(X. CH3I)通过将氢氧根离子加到C(1)=N(+)键形成伪碱基。2'-羟甲基-2-甲基-3,4-二氢罂粟碱碘化物(XV)和2'-羟甲基-2-甲基-9-氧代-3,4-二氢罂粟碱碘化物(XVI)在水性介质中与氢氧根离子反应,形成环状伪碱基XVII和XVIII。在水性乙醇(1:1 w/w,25°C,离子强度0.1)中测定了伪碱基形成的平衡常数(KR+)。季铵罂粟碱衍生物通过大鼠肝酶代谢为异喹啉酮和羰基化合物。讨论了伪碱基在这些生物转化中的作用,并得出了生物合成的结论。