Ammonia → 1,4-Dioxaspiro[4.5]decane-8-carboxamide

To a solution of 1,4-dioxaspiro[4.5]decane-8-carboxylic acid (823 mg, 4.42 mmol) in tetrahydrofuran (22 mL), triethylamine (5.87 mL, 42.1 mmol) and n-propyl chloroformate were added at 0° C., and the obtained solution was stirred at the same temperature for 1 hour. After adding dropwise, the obtained solution was stirred at room temperature for 30 minutes. To the reaction solution, 28% aqueous ammonia (1.5 mL) was added, and the obtained solution was stirred at room temperature for 1 hour. The organic layer was separated from the reaction solution, dried over sodium sulfate and concentrated under reduced pressure. The residue was purified by flash chromatography (silica gel, n-hexane/ethyl acetate) to obtain the captioned compound (694 mg, 3.75 mmol, 85%) as a colorless amorphous product.

1. additionAfter adding dropwise
2. stirringthe obtained solution was stirred at room temperature for 30 minutes
3. stirringthe obtained solution was stirred at room temperature for 1 hour
4. customThe organic layer was separated from the reaction solution
5. dry with materialdried over sodium sulfate
6. concentrationconcentrated under reduced pressure
7. customThe residue was purified by flash chromatography (silica gel, n-hexane/ethyl acetate)

ORD record

ord-31df7071ad4d43008c2359dfd172ffe9

Source dataset

uspto-grants-2013_01

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08349874B2