Acetic Anhydride → 3-((2R)-2-(N-tert-butoxycarbonyl-N-methylamino)-3-phenylpropionylamino)propyl acetate

HRID 1601980Notes

Reaction equation

HRID 1601980 reaction equation
[C:1]([O:5][C:6](=[O:24])[N:7]([C@@H:9]([C:17](=[O:23])[NH:18][CH2:19][CH2:20][CH2:21][OH:22])[CH2:10][C:11]1[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=1)[CH3:8])([CH3:4])([CH3:3])[CH3:2].C(N(CC)CC)C.[C:32](OC(=O)C)(=[O:34])[CH3:33]>ClCCl.CN(C)C1C=CN=CC=1>[C:32]([O:22][CH2:21][CH2:20][CH2:19][NH:18][C:17](=[O:23])[C@H:9]([N:7]([C:6]([O:5][C:1]([CH3:4])([CH3:2])[CH3:3])=[O:24])[CH3:8])[CH2:10][C:11]1[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=1)(=[O:34])[CH3:33]

Participants

6

Reactant 3

HCID 7918Acetic AnhydrideHCID 8471TriethylamineHCID 54054214N-((1R)-1-(3-hydroxypropylcarbamoyl)-2-phenylethyl)-N-methylcarbamic acid tert-butylester

Product 1

HCID 539060843-((2R)-2-(N-tert-butoxycarbonyl-N-methylamino)-3-phenylpropionylamino)propyl acetateYield 82.2%

Reagents, catalysts & solvents 2

HCID 142844-(Dimethylamino)pyridineCatalystHCID 6344DichloromethaneSolvent2×

Procedure

A solution of N-((1R)-1-(3-hydroxypropylcarbamoyl)-2-phenylethyl)-N-methylcarbamic acid tert-butylester (965 mg, 2.86 mmol) in dichloromethane (10 mL) was cooled to 0° C. 4-(dimethylamino)pyridine (35 mg, 0.29 mmol), triethylamine (0.60 mL, 4.29 mmol), and acetic acid anhydride (0.32 mL, 3.43 mmol) were added. The reaction mixture was stirred for 5 hours, while it was warming slowly to room temperature. The reaction mixture was diluted with dichloromethane (100 mL) and washed with 10% sodium hydrogensulfate solution. The aqueous phase was extracted with dichloromethane (2×50 mL). The organic phases were combined and washed with saturated sodium hydrogen carbonate solution. They were dried over magnesium sulfate. The solvent was removed in vacuo, and the crude product was purified by flash chromatography on silica (90 g) with ethyl acetate/dichloromethane (1:3 to 1:1) to give 890 mg of 3-((2R)-2-(N-tert-butoxycarbonyl-N-methylamino)-3-phenylpropionylamino)propyl acetate.

Workup

  1. washwashed with 10% sodium hydrogensulfate solution
  2. extractionThe aqueous phase was extracted with dichloromethane (2×50 mL)
  3. washwashed with saturated sodium hydrogen carbonate solution
  4. dry with materialThey were dried over magnesium sulfate
  5. customThe solvent was removed in vacuo
  6. customthe crude product was purified by flash chromatography on silica (90 g) with ethyl acetate/dichloromethane (1:3 to 1:1)

Sources & evidence

ORD record
ord-05f236485d194c16a5acf8ef3821ab30
Source dataset
uspto-grants-1999_11
Patent number
US05977178

Reaction notes

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