反应详情

To a solution of cis (+/−)-1-(benzyloxycarbonyl)-5-(tert-butoxycarbonylamino)piperidine-3-carboxylic acid (1.0 eq), methanol (20 eq.) and EDC (1.3 eq) in dichloromethane at a concentration of 0.25 M at 0*C was added dimethylaminopyridine (0.1 eq). After stirring for 48 hours as the reaction was allowed to warm to rt the volatiles were removed in vacuo. Upon addition of ethyl actetate and washing with H2O (3×), 1N HCl, NaHCO3(sat.) and brine, the solution was dried over MgSO4, filtered, concentrated and purified by column chromatography (25% ethyl acetate/hexanes) to yield cis (+/−)-1-benzyl 3-methyl 5-(tert-butoxycarbonylamino)piperidine-1,3-dicarboxylate. LCMS (m/z): 293.1 (MH-Boc+); LC Rt=4.09 min

1. customwere removed in vacuo
2. additionUpon addition of ethyl actetate
3. washwashing with H2O (3×), 1N HCl, NaHCO3(sat.) and brine
4. dry with materialthe solution was dried over MgSO4
5. filtrationfiltered
6. concentrationconcentrated
7. custompurified by column chromatography (25% ethyl acetate/hexanes)