tert-butyl 4-[(cyclopropylamino)methyl]-4-hydroxypiperidine-1-carboxylate

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: A sealable reaction vessel was charged with 1,1-dimethylethyl 1-oxa-6-azaspiro[2.5]octane-6-carboxylate (14.07 mmol), ethanol (70 mL) and cyclopropylamine (42.2 mmol). The vessel was purged with nitrogen, sealed and placed in a 75° C. oil bath for 20 h. The reaction mixture was cooled to room temperature and concentrated under reduced pressure. The resulting oil was purified by silica gel chromatography (5% methanol in ethyl acetate). The appropriate fractions were concentrated under reduced pressure and dried to afford the title product (3.56 g, 94% yield) as a viscous colorless oil. MS(ES)+ m/e 271.4 [M+H]+. 1H NMR (400 MHz, DMSO-d6) δ 4.20 (s, 1 H), 3.59 (d, J=12.6 Hz, 2 H), 3.05 (br. s., 2 H), 2.16-2.00 (m, 2 H), 1.49-1.31 (m, 14 H), 0.42-0.29 (m, 2 H), 0.24-0.13 (m, 2 H). The vessel was purged with nitrogen sealed placed in a 75° C. for 20 h concentrated under reduced pressure The resulting oil was purified by silica gel chromatography (5% methanol in ethyl acetate) The appropriate fractions were concentrated under reduced pressure dried