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 883105Notes

Reaction equation

HRID 883105 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-9808b97e87d743ceb6dbb4bd1b7b1bb4
Source dataset
uspto-grants-2012_08
Patent number
US08236825B2

Reaction notes

Loading…