4-Nitrobenzenesulfonyl chloride → (S)-3-{(S)-2-[3-(3,4-dichloro-benzyloxy)-phenyl]-2,3-dihydro-benzo[1,4]dioxin-6-yl}-2-(4-nitro-benzenesulfonylamino)-propionic acid methyl ester

HRID 391828Notes

Reaction equation

HRID 391828 reaction equation
Cl.[CH3:2][O:3][C:4](=[O:34])[C@@H:5]([NH2:33])[CH2:6][C:7]1[CH:32]=[CH:31][C:10]2[O:11][C@@H:12]([C:15]3[CH:20]=[CH:19][CH:18]=[C:17]([O:21][CH2:22][C:23]4[CH:28]=[CH:27][C:26]([Cl:29])=[C:25]([Cl:30])[CH:24]=4)[CH:16]=3)[CH2:13][O:14][C:9]=2[CH:8]=1.C([O-])(O)=O.[Na+].[N+:40]([C:43]1[CH:48]=[CH:47][C:46]([S:49](Cl)(=[O:51])=[O:50])=[CH:45][CH:44]=1)([O-:42])=[O:41]>CCOC(C)=O>[CH3:2][O:3][C:4](=[O:34])[C@@H:5]([NH:33][S:49]([C:46]1[CH:45]=[CH:44][C:43]([N+:40]([O-:42])=[O:41])=[CH:48][CH:47]=1)(=[O:50])=[O:51])[CH2:6][C:7]1[CH:32]=[CH:31][C:10]2[O:11][C@@H:12]([C:15]3[CH:20]=[CH:19][CH:18]=[C:17]([O:21][CH2:22][C:23]4[CH:28]=[CH:27][C:26]([Cl:29])=[C:25]([Cl:30])[CH:24]=4)[CH:16]=3)[CH2:13][O:14][C:9]=2[CH:8]=1

Participants

5

Reactant 3

HCID 74044-Nitrobenzenesulfonyl chlorideHCID 516892Sodium BicarbonateHCID 66719663(S)-2-Amino-3-{(S)-2-[3-(3,4-dichloro-benzyloxy)-phenyl]-2,3-dihydro benzo[1,4]dioxin-6-yl}-propionic acid methyl ester hydrochloride

Product 1

HCID 58327266(S)-3-{(S)-2-[3-(3,4-dichloro-benzyloxy)-phenyl]-2,3-dihydro-benzo[1,4]dioxin-6-yl}-2-(4-nitro-benzenesulfonylamino)-propionic acid methyl esterYield 82.4%

Reagents, catalysts & solvents 1

HCID 8857Ethyl AcetateSolvent

Conditions

Temperature
0 °C

Procedure

(S)-2-Amino-3-{(S)-2-[3-(3,4-dichloro-benzyloxy)-phenyl]-2,3-dihydro benzo[1,4]dioxin-6-yl}-propionic acid methyl ester hydrochloride (0.35 g) was taken in 2 mL of EtOAc and cooled to 0° C., NaHCO3 solution (1 mL) and 4-nitrobenzensulfonyl chloride (178 mg) were added and stirred for 10 minutes. Reaction was stirred at room temperature for 4 hours. EtOAc layer was separated and washed with water and brine, and then dried (Na2SO4), filtered and evaporated. The residue was purified by silica gel column (10% EtOAc in hexanes to 50% EtOAc in hexanes) to get pure (S)-3-{(S)-2-[3-(3,4-dichloro-benzyloxy)-phenyl]-2,3-dihydro-benzo[1,4]dioxin-6-yl}-2-(4-nitro-benzenesulfonylamino)-propionic acid methyl ester (0.37 g). 1H NMR (400 MHz, acetone-d6): 8.33 (m, 2H), 7.89 (m, 2H), 7.73 (d, 1H), 7.62 (d, 1H), 7.37-7.53 (m, 3H), 7.04-7.21 (m, 3H), 6.64-6.72 (m, 3H), 5.22 (s, 2H), 5.09 (m, 1H), 4.35 (m, 1H), 4.21 (m, 1H), 3.97 (m, 1H), 3.61 (s, 3H), 3.03 (m, 1H), 2.76 (m, 1H).

Workup

  1. customReaction
  2. stirringwas stirred at room temperature for 4 hours
  3. customEtOAc layer was separated
  4. washwashed with water and brine
  5. dry with materialdried (Na2SO4)
  6. filtrationfiltered
  7. customevaporated
  8. customThe residue was purified by silica gel column (10% EtOAc in hexanes to 50% EtOAc in hexanes)

Sources & evidence

ORD record
ord-7aa8aa75af224273bd301a78dde3b1a1
Source dataset
uspto-grants-2013_02
Patent number
US08383644B2

Reaction notes

Loading…