Lawesson's reagent → HCID 58424222, compound

Participants

Reaction Steps

A suspension of 6-bromo-2-(thiophen-2-yl)spiro[chroman-4,4′-imidazolidine]-2′,5′-dione (135 mg, 0.357 mmol) and Lawesson's Reagent (144.3 mg, 0.357 mmol) in anhydrous 1,4-dioxane (4 mL) was heated under reflux for 24 h. The mixture was concentrated in vacuo and the residue was purified by preparative TLC to give 6-bromo-2-(thiophen-2-yl)-2′-thioxospiro[chroman-4,4′-imidazolidin]-5′-one (100 mg, 80%). 1H-NMR (CDCl3): 2.41 (m, 1H), 2.55 (dd, 1H), 6.04 (dd, 1H), 6.80 (d, 1H), 6.94 (t, 1H), 7.12 (d, 1H), 7.33 (m, 3H).

Provenance & Evidence