Reaction of Tertiary 2‐Chloroketones with Cyanide Ions: Application to 3‐Chloroquinolinediones
作者:Antonín Klásek、Stanislav Kafka、Ondřej Rudolf、Antonín Lyčka、Michal Rouchal、Lukáš Bednář
DOI:10.1002/open.202100024
日期:2021.6
3-Chloroquinoline-2,4-diones react with cyanide ions in dimethyl formamide to give 3-cyanoquinoline-2,4-diones in small yields due to the strong hindrance of the substituent at the C-3 atom. Good yields can be achieved if the substituent at this position is the methyl group. In the methanol solution, the reaction proceeds by an addition mechanism to form 2-oxo-1a,2,3,7b-tetrahydrooxireno[2,3-c]qui
3-氯喹啉-2,4-二酮与氰化物离子在二甲基甲酰胺中反应生成3-氰基喹啉-2,4-二酮,由于C-3原子上取代基的强烈位阻,产率较低。如果该位置的取代基是甲基,则可以获得良好的产率。在甲醇溶液中,反应通过加成机制进行,形成2-氧代-1a,2,3,7b-四氢氧并[2,3 -c ]喹啉-7b-甲腈,其中4-羟基-3-甲氧基-随后通过用甲醇打开环氧化物环形成2-氧代-1,2,3,4-四氢喹啉-4-甲腈。这些反应的一些次要产物也已被分离出来。测量所制备的化合物的1 H、 13 C 和15 N NMR 谱,并使用适当的二维谱分配所有共振。