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With triethylamine; In dimethyl sulfoxide; at 20 - 70℃; for 5h;Inert atmosphere;
General procedure: The crude starting material (10) was dissolved in DMSO (25 mL) and methyl thioglycolate (2.6 mL, 1.1 equiv.) was added dropwise under Ar at RT. Triethylamine (7.45 mL, 2.2 equiv.) was then added and the mixture was heated at 70 C for 5 hours. The reaction mixture was cooled to RT and poured slowly into vigorously stirred ice-water (250 mL). After 30 min of stirring, a light yellow precipitate was collected by filtration, rinsed with H2O, and dried in vacuo to afford a crude yellow solid (6.40 g, 80% crude yield). The product was used for the next reaction without further purification.