反应详情

To a well-stirred and ice-cooled solution of 1,4-dioxa-8-azaspiro[4.5]decane (34.9 mmol, 5 g) in dichloromethane (200 mL) under an argon atmosphere, was added triethylamine (52.4 mmol, 7.3 mL) and then benzyloxycarbonyl chloride (42 mmol, 5.93 mL) dropwise. The suspension was stirred at room temperature for 24 hours and the precipitated solid was filtered. The organic solution was evaporated under vacuum to give an oily residue which was chromatographed on silica gel eluting with a mixture of ethyl ether and petroleum ether to afford 8-benzyloxycarbonyl 1,4-dioxa-8-azaspiro [4,5] decane in quantitative yield. 1H-NMR (CDCl3): 1.63 (m, 4H); 3.56 (m,4H); 3.89 (s, 4H); 5.09 (s, 2H); 7.28 (s, 5H).

1. stirringThe suspension was stirred at room temperature for 24 hours
2. filtrationthe precipitated solid was filtered
3. customThe organic solution was evaporated under vacuum
4. customto give an oily residue which
5. customwas chromatographed on silica gel eluting with a mixture of ethyl ether and petroleum ether