反应详情

Into a 10-mL round-bottom flask purged and maintained with an inert atmosphere of nitrogen, was placed a solution of tert-butyl 3-(2-(2-(2-(1,3-dioxoisoindolin-2-yl)ethoxy)ethoxy)ethoxy)propanoate (intermediate 179.3) (1.5 g, 3.68 mmol, 1.00 equiv) in neat 2,2,2-trifluoroacetic acid (TFA; 2.0 mL). The resulting solution was stirred for 40 min at ambient temperature. Excess TFA was removed under vacuum to afford a pale-yellow oil residue which was purified on a silica gel column eluting with ethyl acetate/petroleum ether (1:5˜1:2˜2:1) to yield 1.1 g (84%) of 3-(2-(2-(2-(1,3-dioxoisoindolin-2-yl)ethoxy)ethoxy)ethoxy)propanoic acid as a white solid.

1. customInto a 10-mL round-bottom flask purged
2. temperaturemaintained with an inert atmosphere of nitrogen
3. customExcess TFA was removed under vacuum
4. customto afford a pale-yellow oil residue which
5. customwas purified on a silica gel column
6. washeluting with ethyl acetate/petroleum ether (1:5˜1:2˜2:1)