Acetic Acid → (S)-3-[1-(4,6-dimethyl-benzo[d]isothiazol-3-ylmethyl)-2,4-dioxo-1,4-dihydro-2H-pyrido[3,2-d]pyrimidin-3-yl]-pentanoic acid

HRID 1887194Notes

Reaction equation

HRID 1887194 reaction equation
C[O:2][C:3](=[O:32])[CH2:4][C@@H:5]([N:8]1[C:13](=[O:14])[C:12]2[N:15]=[CH:16][CH:17]=[CH:18][C:11]=2[N:10]([CH2:19][C:20]2[C:24]3[C:25]([CH3:30])=[CH:26][C:27]([CH3:29])=[CH:28][C:23]=3[S:22][N:21]=2)[C:9]1=[O:31])[CH2:6][CH3:7].[OH-].[Li+].C(O)(=O)C.O>O1CCOCC1>[CH3:30][C:25]1[C:24]2[C:20]([CH2:19][N:10]3[C:11]4[CH:18]=[CH:17][CH:16]=[N:15][C:12]=4[C:13](=[O:14])[N:8]([C@@H:5]([CH2:6][CH3:7])[CH2:4][C:3]([OH:32])=[O:2])[C:9]3=[O:31])=[N:21][S:22][C:23]=2[CH:28]=[C:27]([CH3:29])[CH:26]=1

Participants

6

Reactant 4

HCID 176Acetic AcidHCID 962WaterHCID 3939Lithium HydroxideHCID 67503561(S)-3-[1-(4,6-dimethyl-benzo[d]isothiazol-3-ylmethyl)-2,4-dioxo-1,4-dihydro-2H-pyrido[3,2-d]pyrimidin-3-yl]-pentanoic acid methyl ester

Product 1

HCID 46853666(S)-3-[1-(4,6-dimethyl-benzo[d]isothiazol-3-ylmethyl)-2,4-dioxo-1,4-dihydro-2H-pyrido[3,2-d]pyrimidin-3-yl]-pentanoic acidYield 34%

Reagents, catalysts & solvents 1

HCID 312751,4-DioxaneSolvent

Procedure

To a solution of 80 mg of (S)-3-[1-(4,6-dimethyl-benzo[d]isothiazol-3-ylmethyl)-2,4-dioxo-1,4-dihydro-2H-pyrido[3,2-d]pyrimidin-3-yl]-pentanoic acid methyl ester in 1,4-dioxane (2.5 mL) is added lithium hydroxide solution (11 mg of lithium hydroxide monohydrate in 0.5 mL of water) at room temperature. The solution is stirred at the same temperature for 3.5 h. Then 0.5 mL of acetic acid is added along with 25 mL of water. The mixture is extracted with ethyl acetate (3×50 mL). The combined organic layers are dried over sodium sulfate and concentrated. The residue is purified by flash chromatography on silica gel to give 26 mg (34%) of (S)-3-[1-(4,6-dimethyl-benzo[d]isothiazol-3-ylmethyl)-2,4-dioxo-1,4-dihydro-2H-pyrido[3,2-d]pyrimidin-3-yl]-pentanoic acid; LCMS (ESMS): m/z 439.12 (M+H+).

Workup

  1. extractionThe mixture is extracted with ethyl acetate (3×50 mL)
  2. dry with materialThe combined organic layers are dried over sodium sulfate
  3. concentrationconcentrated
  4. customThe residue is purified by flash chromatography on silica gel

Sources & evidence

ORD record
ord-63c25d5536534924aa3eae3a9ebfd9fe
Source dataset
uspto-grants-2013_08
Patent number
US08501749B2

Reaction notes

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