Hydrochloric Acid → Ethyl 4-(4-nitro-3-phenyl-butyrylamino)benzoate

HRID 2422938Notes

Reaction equation

HRID 2422938 reaction equation
[C:1]1([CH:7]=[CH:8][C:9]([NH:11][C:12]2[CH:21]=[CH:20][C:15]([C:16]([O:18][CH3:19])=[O:17])=[CH:14][CH:13]=2)=[O:10])[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.[CH2:22]1CCN2C(=NCCC2)CC1.Cl.[N+:34]([CH3:37])([O-:36])=[O:35]>>[N+:34]([CH2:37][CH:7]([C:1]1[CH:2]=[CH:3][CH:4]=[CH:5][CH:6]=1)[CH2:8][C:9]([NH:11][C:12]1[CH:13]=[CH:14][C:15]([C:16]([O:18][CH2:19][CH3:22])=[O:17])=[CH:20][CH:21]=1)=[O:10])([O-:36])=[O:35]

Participants

5

Reactant 4

HCID 313Hydrochloric AcidHCID 6375NitromethaneHCID 811841,8-Diazabicyclo(5.4.0)undec-7-eneHCID 675852Methyl 4-(3-phenylacryloylamino)benzoate

Product 1

HCID 67242330Ethyl 4-(4-nitro-3-phenyl-butyrylamino)benzoateYield 62%

Procedure

A mixture of 41 (1.340 g, 4.44 mmol) in nitromethane (4 ml) was heated a microwave reactor (Biotage Initiator) at 100° C. for 15 min in presence of DBU (0.811 g, 5.328 mmol, 1.2 eq). After cooling to room temperature, the reaction mixture was poured into HCl 1M (10 ml). The product extracted with ethyl acetate (2×15 ml). The organic extracts were collected, dried over Na2SO4 and the solvent removed under reduced pressure. Chromatography on silica gel (7:3 hexanes/ethyl acetate, Rf 0.20) afforded 47 (0.980 g, 2.75 mmol, 62%) as a yellow oil. 1H NMR (400 MHz, CDCl3) δ 1.37 (3H, t, J 7.6 Hz), 2.79 (1H, dd, J 7.2, 15.2 Hz), 2.86 (1H, dd, J 7.2, 15.2 Hz), 4.07 (1H, quint, J 7.2 Hz), 4.34 (2H, q, J 7.2 Hz), 4.72 (1H, dd, J 7.8, 12.6 Hz), 4.83 (1H, dd, J 6.4, 12.4 Hz), 6.63 (1H, d, J 16 Hz), 7.11 (1H, t, J 7.6 Hz), 7.24-7.26 (2H, m), 7.27-7.36 (2H, m), 7.45 (1H, s), 7.47 (2H, d, J 8.8 Hz), 7.96 (2H, d, J 8.8 Hz). 13C NMR (400 MHz, CDCl3) δ 14.55, 40.67, 40.93, 61.20, 79.50, 119.17, 126.54, 127.53, 128.45, 129.48, 130.98, 138.51, 141.60, 166.30, 168.39. MS (API-ES): m/z found 357 [M+H]+ (100%), HRMS (API-ES) m/z found 357.1344 [M+H]+.

Workup

  1. extractionThe product extracted with ethyl acetate (2×15 ml)
  2. customThe organic extracts were collected
  3. dry with materialdried over Na2SO4
  4. customthe solvent removed under reduced pressure

Sources & evidence

ORD record
ord-a777df5975374f3a868c418f1cf033a1
Source dataset
uspto-grants-2011_06
Patent number
US07960434B2

Reaction notes

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