Imidazole → Tert-butyl 3-(((tert-butyldimethylsilyl)oxy)methyl)-4-(oxetan-3-yl)piperazine-1-carboxylate

Participants

Reaction Steps

(+/−) Tert-butyl 3-(hydroxymethyl)-4-(oxetan-3-yl)piperazine-1-carboxylate (1 g, 3.67 mmol) was taken up in DMF (2 mL) and imidazole (0.500 g, 7.34 mmol) and TBS-Cl (0.609 g, 4.04 mmol) were added. The reaction was stirred at room temperature over the weekend. An additional 0.2 eq. of TBS-Cl and 0.5 eq. of imidazole were added, and the reaction mixture was heated at 40° C. overnight, then at 45° C. for 24 h. The reaction mixture was diluted with EtOAc and washed with water 4×. The organic layer was dried over Na2SO4, filtered, and concentrated. The material was purified by flash column chromatography (0-60% EtOAc/Hex). (+/−) Tert-butyl 3-(((tert-butyldimethylsilyl)oxy)methyl)-4-(oxetan-3-yl)piperazine-1-carboxylate (665 mg) was obtained as a colorless oil.

Provenance & Evidence