Thioanisole → methyl (4R)-2-{5-(2-methoxyethoxy)-7-[methyl(pyridin-2-ylsulfonyl)amino]-1H-indol-2-yl}-4,5-dihydro-1,3-thiazole-4-carboxylate

HRID 504963Notes

Reaction equation

HRID 504963 reaction equation
C1(P(=O)(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.FC(F)(F)S(OS(C(F)(F)F)(=O)=O)(=O)=O.[CH3:36][O:37][C:38](=[O:77])[C@H:39]([CH2:68][S:69]CC1C=CC=CC=1)[NH:40][C:41]([C:43]1[NH:44][C:45]2[C:50]([CH:51]=1)=[CH:49][C:48]([O:52][CH2:53][CH2:54][O:55][CH3:56])=[CH:47][C:46]=2[N:57]([CH3:67])[S:58]([C:61]1[CH:66]=[CH:65][CH:64]=[CH:63][N:62]=1)(=[O:60])=[O:59])=O.C1(SC)C=CC=CC=1.C(=O)([O-])O.[Na+]>ClCCl>[CH3:56][O:55][CH2:54][CH2:53][O:52][C:48]1[CH:49]=[C:50]2[C:45](=[C:46]([N:57]([CH3:67])[S:58]([C:61]3[CH:66]=[CH:65][CH:64]=[CH:63][N:62]=3)(=[O:60])=[O:59])[CH:47]=1)[NH:44][C:43]([C:41]1[S:69][CH2:68][C@@H:39]([C:38]([O:37][CH3:36])=[O:77])[N:40]=1)=[CH:51]2

Participants

7

Reactant 5

HCID 7520ThioanisoleHCID 13097Triphenylphosphine OxideHCID 67749Trifluoromethanesulfonic anhydrideHCID 516892Sodium BicarbonateHCID 59136110S-benzyl-N-({5-(2-methoxyethoxy)-7-[methyl(pyridin-2-ylsulfonyl)amino]-1H-indol-2-yl)carbonyl)-L-cysteine methyl ester

Product 1

HCID 86619909methyl (4R)-2-{5-(2-methoxyethoxy)-7-[methyl(pyridin-2-ylsulfonyl)amino]-1H-indol-2-yl}-4,5-dihydro-1,3-thiazole-4-carboxylateYield 87.3%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent3×

Conditions

Temperature
0 °C

Procedure

To a solution of triphenylphosphine oxide (8.9 g) in dichloromethane (12 mL) was added dropwise trifluoromethanesulfonic anhydride (3.9 mL) at 0° C., and the mixture was stirred for 30 min at 0° C. The obtained suspension was diluted with dichloromethane (38 mL), and a solution of S-benzyl-N-({5-(2-methoxyethoxy)-7-[methyl(pyridin-2-ylsulfonyl)amino]-1H-indol-2-yl}carbonyl)-L-cysteine methyl ester (3.2 g) and thioanisole (5.0 mL) in dichloromethane (50 mL) was added. The reaction mixture was stirred at 0° C. for 2 hr, and saturated aqueous sodium hydrogencarbonate solution was added. The mixture was concentrated, and the residue was extracted with ethyl acetate. The ethyl acetate layer was washed with water and saturated brine, dried (MgSO4), and concentrated. The obtained residue was subjected to silica gel column chromatography, and eluted with hexane-ethyl acetate (4:1-1:1, volume ratio) to give a mixture (2.3 g) of methyl (4R)-2-{5-(2-methoxyethoxy)-7-[methyl(pyridin-2-ylsulfonyl)amino]-1H-indol-2-yl}-4,5-dihydro-1,3-thiazole-4-carboxylate and triphenylphosphine oxide. A mixture of the obtained mixture (1.3 g), 2N aqueous sodium hydroxide solution (2.0 mL), tetrahydrofuran (2.0 mL) and methanol (2.0 mL) was stirred at room temperature for 2 hr. Diethyl ether was added to the reaction mixture, and the aqueous layer was separated, and acidified with 1N hydrochloric acid. The mixture was extracted with ethyl acetate. The ethyl acetate layer was washed with water and saturated brine, dried (MgSO4), and concentrated to give the title compound (1.1 g, yield 43%).

Workup

  1. stirringThe reaction mixture was stirred at 0° C. for 2 hr
  2. concentrationThe mixture was concentrated
  3. extractionthe residue was extracted with ethyl acetate
  4. washThe ethyl acetate layer was washed with water and saturated brine
  5. dry with materialdried (MgSO4)
  6. concentrationconcentrated
  7. washeluted with hexane-ethyl acetate (4:1-1:1, volume ratio)

Sources & evidence

ORD record
ord-9625f7526ccc497f94233ad7becec004
Source dataset
uspto-grants-2010_08
Patent number
US07777047B2

Reaction notes

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