反应详情

Treat a 0° C. solution of 4-hydroxy-piperidine (20.0 g, 0.19 mol) and (CH3CH2)3N (24.0 g, 0.24 mol) in CH2Cl2 (200 mL) with methyl bromoacetate (30.21 g, 0.197 mol), warm to room temperature, and stir 2 hours at room temperature under N2. Dilute the reaction with water and extract with 3:1 chloroform:isopropanol. Dry the organic layer (Na2SO4), remove the solvent in vacuo to afford crude product, and purify with a 5% methanol in CH2Cl2 to afford 20.13 g (59%) of the titled product. Rf=0.13 (9/1 CH2Cl2/methanol). ES MS (m/z): 174 (M+).

1. additionDilute
2. extractionextract with 3:1 chloroform
3. dry with materialDry the organic layer (Na2SO4)
4. customremove the solvent in vacuo
5. customto afford crude product
6. custompurify with a 5% methanol in CH2Cl2