反应详情

Prepared using General Procedure 9: To a stirring solution of 4-((N-(2-(tert-butoxy)-2-oxoethyl)-4-(2-(4-methoxyphenyl)acetamido)benzamido)methyl)phenyl 4-(heptyloxy)benzoate INT-5 (6.38 g, 8.83 mmol) in THF (50 mL) was added 1N NaOH (16 mL). The reaction was stirred for 1 h. MeOH (10 mL) was added causing the turbid reaction mixture to clarify. The reaction was stirred for 3 h then neutralized with AcOH. The crude mixture was concentrated then diluted with DCM (60 mL) and washed with brine (30 mL). The organic layer was concentrated and purified by chromatography (EA/hexanes) to afford 2.5 g (56%) of tert-butyl 2-(N-(4-hydroxybenzyl)-4-(2-(4-methoxyphenyl)acetamido)benzamido)acetate INT-7. LCMS-ESI (m/z) calculated for C29H32N2O6: 504; found 503 [M−H]−, tR=2.09 min. (Method 3). 1H NMR (400 MHz, DMSO) δ 10.22 (s, 1H), 9.41-9.29 (m, 1H), 7.69-7.59 (d, J=8.1 Hz, 2H), 7.42-7.20 (m, 4H), 7.19-6.96 (m, 2H), 6.91-6.84 (m, 2H), 6.76-6.68 (m, 2H), 4.58-4.35 (m, 2H), 3.90-3.76 (m, 2H), 3.71 (s, 3H), 3.57 (s, 2H), 1.49-1.21 (m, 9H).

1. customPrepared
2. customthe turbid reaction mixture
3. stirringThe reaction was stirred for 3 h
4. concentrationThe crude mixture was concentrated
5. additionthen diluted with DCM (60 mL)
6. washwashed with brine (30 mL)
7. concentrationThe organic layer was concentrated
8. custompurified by chromatography (EA/hexanes)