反应详情

To a solution of N-dodecyl-3-bromo-4-(2-hydroxyethoxy)-5-(3-chloro-4-fluorophenyl)benzamide (340 mg, 0.61 mmol) in 5 mL CH2Cl2 was added NMMO.H2O (165 mg, 1.22 mmol) and TPAP (22 mg, 0.061 mmol). The reaction mixture was stirred overnight and 2 mL CH3CN and 50 mg, 0.14 mmol TPAP were added. The reaction was stirred for ca 7 hours then 90 mg, 0.665 mmol NMMO.H2O was added and the reaction was stirred overnight. The reaction was worked up by adding H2O and a mixture of sodium bisulfite/sodium dithionite and was stirred for 4 hours. The now grayish mixture was acidified with 2N HCl and extracted with EtOAc (3×). The combined organic layers were dried over Na2SO4 followed by filtration and removal of solvent in vacuo. There yielded a black semisolid that was subjected to column chromatography (40% EtOAc:60% Hexanes) on silica gel pretreated with HCOOH. Yield of the acid is 130 mg, 37% as a dark yellowish brown oil. 1H NMR (DMSO-d6) δ0.84 (t, J=6.81 Hz, 3H); 1.22-1.27 (m, 18H); 1.50 (t, J=6.37 Hz, 2H); 3.23 (q, J=6.81 Hz, 2H); 4.19 (s, 2H); 7.51 (t, J=8.57 Hz, 1H); 7.57-7.61 (m, 1H); 7.81 (dd, J=7.25 Hz, 2.20 Hz, 1H); 7.85 (d, J=2.2 Hz, 1H); 8.10 (d, J=2.20 Hz, 1H); 8.56 (t, J=5.49 Hz, 1H); 12.75 (bs, 1H); IR 3370, 2930, 1730, 1635, 1400, 1225, 1150, and 700 cm−1; mass spectrum [(+)APCI], m/z 570 [M+H]+; Anal. Calcd. for C27H34BrClFNO4: C, 56.80; H, 6.00; N, 2.45, Found: C, 54.30; H, 5.73; N, 2.18.

1. stirringThe reaction was stirred for ca 7 hours
2. stirringthe reaction was stirred overnight
3. stirringwas stirred for 4 hours
4. extractionextracted with EtOAc (3×)
5. dry with materialThe combined organic layers were dried over Na2SO4
6. filtrationfollowed by filtration and removal of solvent in vacuo
7. customThere yielded a black semisolid that