Sodium Hydroxide → 5-Benzyl-7-t-butoxycarbonylamino-7-methyl-5-azaspiro[2.4]heptane

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Reaction Steps

7-Amino-5-benzyl-7-methyl-5-azaspiro[2.4]heptane (7.3 g) was dissolved in toluene (30 mL). t-Butyl dicarbonate (9.3 mL) and 1N aqueous sodium hydroxide (10 mL) were added to the solution, followed by stirring for 15 hours at room temperature and then for 4 hours at 50° C. After completion of reaction, the toluene layer was separated and washed with water, followed by drying with sodium sulfate. The desiccant was removed through filtration, and the filtrate was concentrated under reduced pressure. The residue was purified through silica gel chromatography (hexane:ethyl acetate), to thereby yield the title product (8.745 g, yield: 820). Notably, when optically active 7-amino-5-benzyl-7-methyl-5-azaspiro[2.4]heptane is treated in accordance with the above-described procedure, the corresponding optically active target product can be yielded without decreasing optical purity.

Provenance & Evidence