反应详情

2-[4-(3,4-Dichloro-benzyloxy)-phenyl]-2-hydroxy-acetic acid 3,4-dichloro-benzyl ester (9.4 g,) was dissolved in 120 mL of THF-methanol (4:1) and 2N lithium hydroxide solution (39 mL) added. The resulting reaction mixture was stirred at room temperature 16 h. The mixture was poured onto 1N HCl and EtOAc and the organic layer was washed with brine, dried over sodium sulfate, and concentrated. The residual oil was taken up in minimal DCM and hexanes added to give a solid. The solid was filtered and washed with hexanes to afford the desired product [4-(3,4-dichloro-benzyloxy)-phenyl]-hydroxy-acetic acid in pure form (6.1 g). 1H NMR (400 MHz, DMSO d6): 7.69 (d, 1H), 7.63 (d, 1H), 7.41 (m, 1H), 7.31 (m, 2H), 6.96 (m, 2H), 5.10 (s, 2H), 4.94 (s, 1H).

1. customThe resulting reaction mixture
2. washthe organic layer was washed with brine
3. dry with materialdried over sodium sulfate
4. concentrationconcentrated
5. additionhexanes added
6. customto give a solid
7. filtrationThe solid was filtered
8. washwashed with hexanes