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 708618Notes

Reaction equation

HRID 708618 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 seperated 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 seperated
  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-50c9e37c10d148e786e1ab52787ac375
Source dataset
uspto-grants-2015_11
Patent number
US09175003B2

Reaction notes

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