4-Amino-2,2,6,6-tetramethylpiperidine → HCID 178426364, compound

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Reaction Steps

Neat 2-methylsulfanyl-pyrimidin-4-ol (5 g, 35 mmol) and 2,2,6,6-tetramethyl-piperidin-4-ylamine (8.243 g, 52.75 mmol) were heated to 170° C. with stirring for 2 hours. After cooling, the brown solid was triturated with ether. Filtration gave 8.16 g (93%) of 2-(2,2,6,6-Tetramethyl-piperidin-4-ylamino)-pyrimidin-4-ol. This crude (8 g, 32 mmol) was suspended in 160 ml of acetonitrile. Then, 4N-HCl in dioxane (24 ml, 96 mmol) and POCl3 (7.32 ml, 80 mmol) were added successively and the suspension was heated to reflux (105° C. heat bath) for 2 hours. After that, the mixture was cooled, diluted with EtOAc and washed twice with 2N-NaOH, then brine, dried over sodium sulfate and evaporated. Chromatography on silicagel (EtOAc/MeOH/ammonia:2/1/0.02) gave (4-chloro-pyrimidin-2-yl)-(2,2,6,6-tetramethyl-piperidin-4-yl)-amine as a beige solid. Yield: 7.68 g (89%).

Provenance & Evidence