Diisopropylethylamine → tert-butyl 3-((S)-3-((S)-2-(tert-butyldiphenylsilyloxy)propanoyl)-5-(3-fluorophenyl)-2-phenyl-2,3-dihydro-1,3,4-thiadiazol-2-yl)propylcarbamate

HRID 270504Notes

Reaction equation

HRID 270504 reaction equation
[F:1][C:2]1[CH:3]=[C:4]([C:8]2[S:12][C:11]([CH2:19][CH2:20][CH2:21][NH:22][C:23](=[O:29])[O:24][C:25]([CH3:28])([CH3:27])[CH3:26])([C:13]3[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=3)[NH:10][N:9]=2)[CH:5]=[CH:6][CH:7]=1.[Si:30]([O:47][C@@H:48]([CH3:52])[C:49](O)=[O:50])([C:43]([CH3:46])([CH3:45])[CH3:44])([C:37]1[CH:42]=[CH:41][CH:40]=[CH:39][CH:38]=1)[C:31]1[CH:36]=[CH:35][CH:34]=[CH:33][CH:32]=1.C1CN([P+](ON2N=NC3C=CC=CC2=3)(N2CCCC2)N2CCCC2)CC1.F[P-](F)(F)(F)(F)F.CCN(C(C)C)C(C)C>CN(C=O)C>[Si:30]([O:47][C@@H:48]([CH3:52])[C:49]([N:10]1[N:9]=[C:8]([C:4]2[CH:5]=[CH:6][CH:7]=[C:2]([F:1])[CH:3]=2)[S:12][C@@:11]1([CH2:19][CH2:20][CH2:21][NH:22][C:23](=[O:29])[O:24][C:25]([CH3:26])([CH3:28])[CH3:27])[C:13]1[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1)=[O:50])([C:43]([CH3:45])([CH3:46])[CH3:44])([C:37]1[CH:38]=[CH:39][CH:40]=[CH:41][CH:42]=1)[C:31]1[CH:32]=[CH:33][CH:34]=[CH:35][CH:36]=1

Participants

6

Reactant 4

HCID 81531DiisopropylethylamineHCID 2724699PyBOPHCID 11232725Propanoic acid, 2-[[(1,1-dimethylethyl)diphenylsilyl]oxy]-, (2S)-HCID 67214060Tert-butyl 3-(5-(3-fluorophenyl)-2-phenyl-2,3-dihydro-1,3,4-thiadiazol-2-yl)propylcarbamate

Product 1

HCID 67214329tert-butyl 3-((S)-3-((S)-2-(tert-butyldiphenylsilyloxy)propanoyl)-5-(3-fluorophenyl)-2-phenyl-2,3-dihydro-1,3,4-thiadiazol-2-yl)propylcarbamateYield 19.1%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

To a solution of tert-butyl 3-(5-(3-fluorophenyl)-2-phenyl-2,3-dihydro-1,3,4-thiadiazol-2-yl)propylcarbamate (0.54 g, 1.30 mmol) and (S)-2-(tert-butyldiphenylsilyloxy)propanoic acid (0.64 g, 1.95 mmol) in DMF (10 mL) was added PyBOP (1.01 g, 1.95 mmol) followed by DIEA (0.34 g, 2.60 mmol). After stirring at room temperature for 14 hours, the reaction mixture was partitioned between 10% Na2CO3 (100 mL) and ethyl acetate (100 mL). The aqueous layer was extracted with ethyl acetate (40 mL). The combined organics were washed with brine (100 mL), dried over Na2SO4, filtered and concentrated under reduced pressure. The residue was chromatographed (1:9 to 1:4 ethyl acetate/hexanes) to provide the less polar diastereomer product (180 mg, 19%) as a yellow syrup.

Workup

  1. customthe reaction mixture was partitioned between 10% Na2CO3 (100 mL) and ethyl acetate (100 mL)
  2. extractionThe aqueous layer was extracted with ethyl acetate (40 mL)
  3. washThe combined organics were washed with brine (100 mL)
  4. dry with materialdried over Na2SO4
  5. filtrationfiltered
  6. concentrationconcentrated under reduced pressure
  7. customThe residue was chromatographed (1:9 to 1:4 ethyl acetate/hexanes)

Sources & evidence

ORD record
ord-06bda7292c1d41e4a4ae5a8c0bd33323
Source dataset
uspto-grants-2008_11
Patent number
US07449486B2

Reaction notes

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