Acetic Anhydride → HCID 18337568, compound

HRID 1760793Notes

Reaction equation

HRID 1760793 reaction equation
[CH2:1]([O:8][NH:9][C:10](=[O:38])[C@H:11]([N:14]([CH2:28][C:29]1[CH:34]=[CH:33][C:32]2[O:35][CH2:36][O:37][C:31]=2[CH:30]=1)[S:15]([C:18]1[C:23]([CH3:24])=[CH:22][C:21]([O:25][CH3:26])=[CH:20][C:19]=1[CH3:27])(=[O:17])=[O:16])[CH2:12][OH:13])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[C:39](OC(=O)C)(=[O:41])[CH3:40]>N1C=CC=CC=1>[CH2:1]([O:8][NH:9][C:10](=[O:38])[C@H:11]([N:14]([CH2:28][C:29]1[CH:34]=[CH:33][C:32]2[O:35][CH2:36][O:37][C:31]=2[CH:30]=1)[S:15]([C:18]1[C:23]([CH3:24])=[CH:22][C:21]([O:25][CH3:26])=[CH:20][C:19]=1[CH3:27])(=[O:17])=[O:16])[CH2:12][O:13][C:39](=[O:41])[CH3:40])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1

Participants

4

Reactant 2

HCID 7918Acetic AnhydrideHCID 18337569HCID 18337569, compound

Product 1

HCID 18337568HCID 18337568, compound

Reagents, catalysts & solvents 1

HCID 1049PyridineSolvent

Procedure

To a solution of N-benzyloxy-2(R)-[(3,4-methylenedioxybenzyl)-(4-methoxy-2,6-dimethylbenzenesulfonyl)amino]-3-hydroxypropionamide (450 mg, 0.82 mmol) in pyridine (2 mL) at 0° C. was added acetic anhydride (0.09 mL, 0.98 mmol). The reaction mixture was allowed to warm to room temperature over 12 h and then partitioned between 2 N aqueous hydrochloric acid and methylene chloride (100 mL). The methylene chloride layer was separated, dried over magnesium sulfate, and concentrated. Purification of the residue by preparative TLC (30% ethyl acetate-hexanes) gave N-benzyloxy-2(R)-[(3,4-methylenedioxy-benzyl)-(4-methoxy-2,6-dimethylbenzenesulfonyl)amino]-3-acetoxypropionamide.

Workup

  1. custompartitioned between 2 N aqueous hydrochloric acid and methylene chloride (100 mL)
  2. customThe methylene chloride layer was separated
  3. dry with materialdried over magnesium sulfate
  4. concentrationconcentrated
  5. customPurification of the residue by preparative TLC (30% ethyl acetate-hexanes)

Sources & evidence

ORD record
ord-968e271dc3ef46f18ab2039a27be9979
Source dataset
uspto-grants-2005_01
Patent number
US06844366B2

Reaction notes

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