Iodine → n-(4-Iodo-6-thiomorpholin-4-yl-pyridin-3-yl)-2,2-dimethyl-propionamide

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Under argon) a solution of 75 g (268 mmol) 2,2-dimethyl-N-(6-thiomorpholin-4-yl-pyridin-3-yl)-propionamide, 187 g (1.61 mol) N,N,N′,N′-tetramethylethylenediamine and 85 g (604 mmol) 2,2,6,6,-tetramethylpiperidine in 750 ml tetrahydrofuran was cooled to −65° C. in a dry ice bath. Within 30 min, 805 ml (1.29 mol) of a 1.6 N n-butyllithium solution in hexane were added dropwise. The reaction mixture was allowed to warm up to −15° C. and was stirred for 3 h at this temperature. After cooling again to −70° C., 354 g (1.40 mol) iodine (dissolved in 1000 ml tetrahydrofuran) were added dropwise during 2 h and stirring was continued for 1 h. The suspension was warmed to −60° C. and was poured into 1000 ml of 30% sodium thiosulfate pentahydrate solution. Then, 750 ml tert-butyl methyl ether were added and the organic layer was separated. The aqueous layer was extracted three times with 750-ml portions of tert-butyl methyl ether and the combined organic layers were dried (sodium sulfate) and evaporated. Flash chromatography gave 68.9 g (63%) of the title compound as light brown crystals.

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