Eschenmoser coupling reactions starting from primary thioamides. When do they work and when not?

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 to nitriles) were identified. The key factor that enables the successful Eschenmoser coupling reaction involves the optimum balance in acidity of nitrogen and carbon atoms of the intermediary α-thioiminium salts.

Beilstein J. Org. Chem. 2023, 19, 808–819. doi:10.3762/bjoc.19.61

Source: Beilstein Journal of Organic Chemistry - June 9, 2023 Category: Chemistry Authors: Beilstein Journal of Organic Chemistry - Syndicated Feeds Tags: Eschenmoser coupling reaction Hantzsch thiazole synthesis isoquinolin-4-ones primary thioamides structure – reactivity relationships Full Research Paper Source Type: research