作者:H. Poschenrieder、H.-D. Stachel、B. Wiesend、K. Polborn
DOI:10.1002/jhet.5570400108
日期:2003.1
Ozonolysis of the pyrrolidinediones 4 afforded the pyrrolidinetriones 5, which in the presence of Lewis acids were converted into maleimide 6. Analogously, ozonolysis of the pyrrolidinones 7 gave the pyrrolidinediones 8, which were converted into the pyridinetriones 11a, b via Lewis acid catalyzed isomerization to yield the trihydroxypyridones 10 and ensuing air oxidation. In solution two tautomeric
吡咯烷二酮4的臭氧分解得到吡咯烷三酮5,在路易斯酸存在下将其转化为马来酰亚胺6。类似地,吡咯烷酮7的臭氧分解得到吡咯烷二酮8,其通过路易斯酸催化的异构化转化为吡啶三酮11a,b ,从而产生三羟基吡啶酮10并随后进行空气氧化。在溶液中,可以存在两种互变异构形式的吡啶三酮11,它们都代表羟基氮杂苯并醌。分两步将化合物11转化为氮杂醌衍生物19。另一类氮杂醌的代表是化合物28a,b。这些是从吡啶酮25分两步生成的。氮杂醌28a容易与酸性化合物反应,产生加合物26、27和29或与2-丁烯醛形成环加合物30。