Synthesis of 2H-[1,2]oxazino[3,4-c]quinoline-2,5(6H)-diones from 6-oxo-6H-1,2-oxazine-3-carboxylates
作者:Elvira R. Zaitseva、Dmitry S. Ivanov、Alexander Yu. Smirnov、Nadezhda S. Baleeva、Mikhail S. Baranov
DOI:10.1007/s10593-023-03201-2
日期:2023.5
A methodology was developed for the synthesis of 1-ethoxy-6-methyl-2H-[1,2]oxazino[3,4-c]quinoline-2,5(6H)-diones from methyl 4-[2-(dimethylamino)phenyl]-5-ethoxy-6-oxo-6H-1,2-oxazine-3-carboxylates by the action of titanium tetrachloride under inert atmosphere. This interaction provides a rare example of demethylation followed by cyclization, yielding several new compounds.
开发了一种从甲基 4-[2- 合成 1-乙氧基-6-甲基-2 H -[1,2]恶嗪基[3,4- c ]喹啉-2,5(6 H )-二酮的方法(二甲基氨基)苯基]-5-乙氧基-6-氧代-6H- 1,2-恶嗪-3-羧酸酯在惰性气氛下与四氯化钛作用。这种相互作用提供了去甲基化随后环化的罕见例子,产生了几种新化合物。