Diisopropylethylamine → (S)-2-(tert-butyldiphenylsilyloxy)-1-((R)-5-(2,5-difluorophenyl)-2-((methoxymethoxy)methyl)-2-phenyl-1,3,4-thiadiazol-3(2H)-yl)propan-1-one

HRID 2421432Notes

Reaction equation

HRID 2421432 reaction equation
[Si:1]([O:18][C@@H:19]([CH3:23])[C:20](O)=[O:21])([C:14]([CH3:17])([CH3:16])[CH3:15])([C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[F:24][C:25]1[CH:30]=[CH:29][C:28]([F:31])=[CH:27][C:26]=1[C:32]1[S:36][C:35]([CH2:43][O:44][CH2:45][O:46][CH3:47])([C:37]2[CH:42]=[CH:41][CH:40]=[CH:39][CH:38]=2)[NH:34][N:33]=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.C([O-])(O)=O.[Na+]>CN(C=O)C>[Si:1]([O:18][C@@H:19]([CH3:23])[C:20]([N:34]1[N:33]=[C:32]([C:26]2[CH:27]=[C:28]([F:31])[CH:29]=[CH:30][C:25]=2[F:24])[S:36][C@@:35]1([CH2:43][O:44][CH2:45][O:46][CH3:47])[C:37]1[CH:42]=[CH:41][CH:40]=[CH:39][CH:38]=1)=[O:21])([C:14]([CH3:16])([CH3:17])[CH3:15])([C:8]1[CH:9]=[CH:10][CH:11]=[CH:12][CH:13]=1)[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1

Participants

7

Reactant 5

HCID 81531DiisopropylethylamineHCID 516892Sodium BicarbonateHCID 2724699PyBOPHCID 11232725Propanoic acid, 2-[[(1,1-dimethylethyl)diphenylsilyl]oxy]-, (2S)-HCID 672148995-(2,5-Difluorophenyl)-2-((methoxymethoxy)methyl)-2-phenyl-2,3-dihydro-1,3,4-thiadiazole

Product 1

HCID 67214650(S)-2-(tert-butyldiphenylsilyloxy)-1-((R)-5-(2,5-difluorophenyl)-2-((methoxymethoxy)methyl)-2-phenyl-1,3,4-thiadiazol-3(2H)-yl)propan-1-oneYield 12%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

To a solution of (S)-2-(tert-butyldiphenylsilyloxy)propanoic acid (0.70 g, 2.14 mmol) in DMF (20 mL) was added 5-(2,5-difluorophenyl)-2-((methoxymethoxy)methyl)-2-phenyl-2,3-dihydro-1,3,4-thiadiazole (0.50 g, 1.43 mmol) followed by PyBOP (1.11 g, 2.14 mmol) and DIEA (497 μL, 2.85 mmol). After stirring at room temperature for 16 hours, the mixture was treated with saturated NaHCO3 (50 mL) and extracted with ethyl acetate (3×30 mL). The combined organics were washed with water (6×30 mL) and brine (30 mL), dried over Na2SO4, and concentrated under reduced pressure. The yellow residue was chromatographed (19:1 to 9:1 hexanes/ethyl acetate) to afford the less polar diastereomer (S)-2-(tert-butyldiphenylsilyloxy)-1-((R)-5-(2,5-difluorophenyl)-2-((methoxymethoxy)methyl)-2-phenyl-1,3,4-thiadiazol-3(2H)-yl)propan-1-one (110 mg, 12%), and the more polar diastereomer (S)-2-(tert-butyldiphenylsilyloxy)-1-((S)-5-(2,5-difluorophenyl)-2-((methoxymethoxy)methyl)-2-phenyl-1,3,4-thiadiazol-3(2H)-yl)propan-1-one (146 mg of a 1:1 mixture with starting material) as yellow oils. Absolute stereochemistry was assigned by inference from (S)-1-((R)-5-(2,5-difluorophenyl)-2-(hydroxymethyl)-2-phenyl-1,3,4-thiadiazol-3(2H)-yl)-2-methoxypropan-1-one.

Workup

  1. extractionextracted with ethyl acetate (3×30 mL)
  2. washThe combined organics were washed with water (6×30 mL) and brine (30 mL)
  3. dry with materialdried over Na2SO4
  4. concentrationconcentrated under reduced pressure
  5. customThe yellow residue was chromatographed (19:1 to 9:1 hexanes/ethyl acetate)

Sources & evidence

ORD record
ord-45b917959ea545a0b628d420c9b5568b
Source dataset
uspto-grants-2011_06
Patent number
US07956073B2

Reaction notes

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