Eschenmoser coupling reactions starting from primary thioamides. When do they work and when not?
作者:Lukáš Marek、Jiří Váňa、Jan Svoboda、Jiří Hanusek
DOI:10.3762/bjoc.19.61
日期:——
Abstract Reactions of thiobenzamide or thioacetamide with 4-bromo-1,1-dimethyl-1,4-dihydroisoquinoline-3(2H)-one, 4-bromoisoquinoline-1,3(2H,4H)-dione and two α-bromo(phenyl)acetamides were examined under various conditions (base, solvent, thiophile, temperature) and structure/medium features that influence product distribution (Eschenmoser coupling reaction, Hantzsch thiazole synthesis and elimination
摘要 硫代苯甲酰胺或硫代乙酰胺与4-溴-1,1-二甲基-1,4-二氢异喹啉-3(2 H )-酮、4-溴异喹啉-1,3(2 H ,4 H )-二酮和两个α-的反应在各种条件(碱、溶剂、亲硫剂、温度)下对溴(苯基)乙酰胺进行了检查,并确定了影响产物分布(Eschenmoser 偶联反应、Hantzsch 噻唑合成和消除为腈)的结构/介质特征。Eschenmoser 偶联反应成功的关键因素涉及中间 α-硫代亚胺盐的氮原子和碳原子的酸度的最佳平衡。 贝尔斯坦 J. 组织。化学。 2023, 19, 808–819。doi:10.3762/bjoc.19.61