Electrochemical oxidation of aromatic ethers. Part 8. Evidence of homogeneous electron transfer during the ‘low potential’ oxidation of laudanosine
作者:Michael Hutchins、Malcolm Sainsbury、David I. C. Scopes
DOI:10.1039/p19830002059
日期:——
4-dihydroisoquinolines and veratraldehyde, the latter being an oxidation product of the 3,4-dimethoxybenzyl radical and/or cation. From this evidence, and the results of an electrolysis experiment carried out at high dilution, it is considered that the anodic cyclisation of laudanosine to O-methylflavinantine proceeds through homogeneous electron transfer rather than via homoconjugative activation within the
1,2,3,4-四氢罂粟碱的N-氨基和N-亚硝基衍生物的光解作用无法产生类似于O-甲基黄素的芳基芳基偶联产物。相反,杂环的1-和2-取代基均被裂解,得到6,7-二甲氧基-3,4-二氢异喹啉和藜芦醛,后者是3,4-二甲氧基苄基和/或阳离子的氧化产物。从该证据以及高稀释度下进行的电解实验的结果,可以认为月桂丹碱到O-甲基黄素的阳极环化是通过均匀的电子转移而不是通过 其他工作者提出的中间自由基阳离子内的同共轭活化作用。