反应详情

Prepared using General Procedure 4: To a stirring solution of 4-((4-nitrobenzamido)methyl)phenyl 4-(heptyloxy)benzoate INT-2 (857 mg, 1.75 mmol) in DMF (7 mL) was added sodium hydride (77.0 mg, 1.92 mmol). After 5 min, tert-butyl 2-bromoacetate (0.30 mL, 2.01 mmol) was added. After stirring at room temperature for 1 h, additional tert-butyl 2-bromoacetate (0.297 mL, 2.01 mmol) and sodium hydride (77.0 mg, 1.92 mmol) were added and the reaction stirred for another 1 h. The reaction mixture was diluted with EA (100 mL) and washed with brine (200 mL). The organic layer was concentrated and purified by chromatography (EA/hexanes) to provide 888 mg (84%) of 4-((N-(2-(tert-butoxy)-2-oxoethyl)-4-nitrobenzamido)methyl)phenyl 4-(heptyloxy)benzoate INT-3. LCMS-ESI (m/z) calculated for C34H40N2O8: 604; no m/z observed, tR=3.62 min (Method 5).

1. customPrepared
2. stirringthe reaction stirred for another 1 h
3. washwashed with brine (200 mL)
4. concentrationThe organic layer was concentrated
5. custompurified by chromatography (EA/hexanes)