Triphenylphosphine → (R)-4-(benzothiazol-2-ylsulfanyl-methyl)-2,2-dimethyl-oxazolidine-3-carboxylic acid tert-butyl ester

HRID 885177

Reaction equation

HRID 885177 reaction equation
[C:1]([O:5][C:6]([N:8]1[C@@H:12]([CH2:13]O)[CH2:11][O:10][C:9]1([CH3:16])[CH3:15])=[O:7])([CH3:4])([CH3:3])[CH3:2].[SH:17][C:18]1[S:19][C:20]2[CH:26]=[CH:25][CH:24]=[CH:23][C:21]=2[N:22]=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.N(C(OCC)=O)=NC(OCC)=O>C1COCC1.CCOC(C)=O>[C:1]([O:5][C:6]([N:8]1[C@@H:12]([CH2:13][S:17][C:18]2[S:19][C:20]3[CH:26]=[CH:25][CH:24]=[CH:23][C:21]=3[N:22]=2)[CH2:11][O:10][C:9]1([CH3:16])[CH3:15])=[O:7])([CH3:4])([CH3:3])[CH3:2]

Participants

7

Reactant 4

HCID 11776TriphenylphosphineHCID 220568ethyl N-ethoxycarbonyliminocarbamateHCID 11053463(S)-4-Hydroxymethyl-2,2-dimethyl-oxazolidine-3-carboxylic acid tert-butyl esterHCID 178418395HCID 178418395, compound

Product 1

HCID 67178031(R)-4-(benzothiazol-2-ylsulfanyl-methyl)-2,2-dimethyl-oxazolidine-3-carboxylic acid tert-butyl esterYield 93.9%

Reagents, catalysts & solvents 2

HCID 8028TetrahydrofuranSolventHCID 8857Ethyl AcetateSolvent

Procedure

To a stirred, cooled (0° C.) solution of (S)-4-hydroxymethyl-2,2-dimethyl-oxazolidine-3-carboxylic acid tert-butyl ester (1.36 g), 2-mercaptobenzothiazole (1.48 g) and triphenylphosphine (2.32 g) in THF (80 ml) under an argon atmosphere was added diethyl azodicarboxylate (4.1 ml; 40% solution in toluene). The mixture (soon turning to a yellow suspension, slowly warming up to r.t.) was stirred for 18 h overnight, then diluted with EtOAc and washed with sat. aq. Na2CO3. The aqueous phase was back extracted with EtOAc. The combined organics were washed with brine, dried over MgSO4, filtered and concentrated. The crude product was purified by column chromatography (SiO2; gradient: cyclohexane→cyclohexane/EtOAc 85:15) to give (R)-4-(benzothiazol-2-ylsulfanyl-methyl)-2,2-dimethyl-oxazolidine-3-carboxylic acid tert-butyl ester (2.1 g) as light yellow viscous oil.

Workup

  1. washwashed with sat. aq. Na2CO3
  2. extractionThe aqueous phase was back extracted with EtOAc
  3. washThe combined organics were washed with brine
  4. dry with materialdried over MgSO4
  5. filtrationfiltered
  6. concentrationconcentrated
  7. customThe crude product was purified by column chromatography (SiO2; gradient: cyclohexane→cyclohexane/EtOAc 85:15)

Sources & evidence

ORD record
ord-c9bccc7737134456940d9f06d90639a7
Source dataset
uspto-grants-2012_08
Patent number
US08242153B2

Linked notes

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