Organic heterocyclothiazenes. Part 5. Cycloaddition reactions of tetrasulphur tetranitride with highly electron deficient alkynes
作者:Peter J. Dunn、Charles W. Rees
DOI:10.1039/p19870001579
日期:——
4-trifluorobutynonitrile (4) similarly give the trithiadiazepines (10) and (12), though more slowly and in slightly lower yields. Structures (8) and (10) correct literature assignments. The analogous reactions of ethyl 3-formylpropynoate (6), hex-3-yne-2,5-dione (7), and butynedial, like those of acetylenedicarboxylate esters, give complex mixtures from which trithiadiazepines, trithiatriazepines, and thiadiazoles
与先前的复杂S 4 N 4-炔反应相反,丁腈和S 4 N 4的处理可得到1,3,5,2,4-三噻二氮杂-6,7-二碳腈(8)和1, 2,5-噻二唑-3,4-二甲腈(9)非常干净,收率很高。六氟丁-2-炔和4,4,4-三氟丁腈(4)类似地产生三噻二氮杂(10)和(12),尽管速度较慢且收率略低。结构(8)和(10)纠正文献分配。3-甲酰基丙酸乙酯(6),己-3-炔-2,5-二酮(6)的类似反应7),丁炔和乙炔二羧酸酯一样,得到复杂的混合物,从中可以不同地分离出三噻二氮杂,三噻三氮杂和噻二唑。建议对这些结果进行机械合理化。由S 4 N 4和1,1,4,4-四乙氧基丁炔(20)以高收率制备1,2,5-噻二唑-3,4-二甲醛(18b),然后进行水解。该二醛和其他3,4-二氧代-1,2,5-噻二唑首次用于制备1,2,5-噻二唑并[3,4- d ]哒嗪及其衍生物(22)。改进的3-甲酰基丙酸乙酯(6)和十六烷基-3-炔-2