Potassium Carbonate → 4-Methoxybenzyl (2RS)-2-hydroxy-2-[(3R,4R)-3-phenylacetamido-4-[(RS)-tetrahydrofuran-2-yl-carbonylmethylthio]-azetidin-2-on-1-yl]acetate

HRID 1421793Notes

Reaction equation

HRID 1421793 reaction equation
[OH:1][CH:2]([N:15]1[C@H:18]([SH:19])[C@H:17]([NH:20][C:21](=[O:29])[CH2:22][C:23]2[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=2)[C:16]1=[O:30])[C:3]([O:5][CH2:6][C:7]1[CH:12]=[CH:11][C:10]([O:13][CH3:14])=[CH:9][CH:8]=1)=[O:4].Br[CH2:32][C:33]([CH:35]1[CH2:39][CH2:38][CH2:37][O:36]1)=[O:34].C(=O)([O-])[O-].[K+].[K+]>CC(C)=O.C(OCC)(=O)C>[OH:1][CH:2]([N:15]1[C@H:18]([S:19][CH2:32][C:33]([CH:35]2[CH2:39][CH2:38][CH2:37][O:36]2)=[O:34])[C@H:17]([NH:20][C:21](=[O:29])[CH2:22][C:23]2[CH:24]=[CH:25][CH:26]=[CH:27][CH:28]=2)[C:16]1=[O:30])[C:3]([O:5][CH2:6][C:7]1[CH:12]=[CH:11][C:10]([O:13][CH3:14])=[CH:9][CH:8]=1)=[O:4]

Participants

6

Reactant 3

HCID 11430Potassium CarbonateHCID 219089652-Bromo-1-(oxolan-2-yl)ethan-1-oneHCID 544549564-methoxybenzyl (2RS)-2-hydroxy-2-[(3R,4R)-4-mercapto-3-phenylacetamidoazetidin-2-on-1-yl]acetate

Product 1

HCID 152797404-Methoxybenzyl (2RS)-2-hydroxy-2-[(3R,4R)-3-phenylacetamido-4-[(RS)-tetrahydrofuran-2-yl-carbonylmethylthio]-azetidin-2-on-1-yl]acetate

Reagents, catalysts & solvents 2

HCID 180AcetoneSolvent2×HCID 8857Ethyl AcetateSolvent

Procedure

The crude thiol was dissolved in acetone (35 ml) and treated with a solution of (RS)-2-bromoacetyltetrahydrofuran (3.48 g, 18.0 mmol) in acetone (5 ml). After 10 min, potassium carbonate (1.24 g, 8.9 mmol) was added, and the mixture stirred for a further 30 min. The reaction mixture was diluted with ethyl acetate, washed successively with water (×2) and brine, dried and concentrated. The residue was flash chromatographed on silica gel eluting with 50, 70 and is 80% ethyl acetate in hexane yielding the title compound as a colourless foam (5.40 g, 55%); νmax (CH2Cl2) 3409, 1781, 1745, 1684, 1613, 1516 cm-1. [Mass spectrum +ve ion (3-nitrobenzyl alcohol, sodium acetate) MNa+ (565)].

Workup

  1. washwashed successively with water (×2) and brine
  2. customdried
  3. concentrationconcentrated
  4. customchromatographed on silica gel eluting with 50, 70

Sources & evidence

ORD record
ord-9a00a7cf8f354258b0b8c3a3235fd422
Source dataset
uspto-grants-2000_06
Patent number
US06077952

Reaction notes

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