反应详情

温度

0 °C

(3S)-8-Tert-butyl 3-ethyl 2,8-diazaspiro[4.5]decane-3,8-dicarboxylate [Example 24 in US Pat. Pub. No. 2012/0101280](50 g, 160 mmol) in CH2Cl2 (500 mL), and Et3N (51.7 g, 512 mmol) was cooled to 0° C. Benzyl chloroformate (34.1 g, 205 mmol) was added dropwise and the mixture was stirred at 0° C. for 3 h. The reaction mixture was washed with water, extracted with CH2Cl2, dried over Na2SO4, and concentrated in vacuo to provide (S)-2-benzyl 8-tert-butyl 3-ethyl 2,8-diazaspiro[4.5]decane-2,3,8-tricarboxylate as a light yellow oil which was used directly without further purification.

1. washThe reaction mixture was washed with water
2. extractionextracted with CH2Cl2
3. dry with materialdried over Na2SO4
4. concentrationconcentrated in vacuo