Phosphoric Acid → 2-(6-((5-(4-Chlorophenyl)isoxazol-3-yl)methoxy)-5-methylbenzo[b]thiophen-3-yl)acetic acid

HRID 1814183Notes

Reaction equation

HRID 1814183 reaction equation
C[O:2][C:3](=[O:29])[CH2:4][C:5]1[C:6]2[CH:13]=[C:12]([CH3:14])[C:11]([O:15][CH2:16][C:17]3[CH:21]=[C:20]([C:22]4[CH:27]=[CH:26][C:25]([Cl:28])=[CH:24][CH:23]=4)[O:19][N:18]=3)=[CH:10][C:7]=2[S:8][CH:9]=1.[OH-].[K+].OP(O)(O)=O>O1CCCC1>[CH3:14][C:12]1[C:11]([O:15][CH2:16][C:17]2[CH:21]=[C:20]([C:22]3[CH:23]=[CH:24][C:25]([Cl:28])=[CH:26][CH:27]=3)[O:19][N:18]=2)=[CH:10][C:7]2[S:8][CH:9]=[C:5]([CH2:4][C:3]([OH:29])=[O:2])[C:6]=2[CH:13]=1

Participants

5

Reactant 3

HCID 1004Phosphoric AcidHCID 14797Potassium HydroxideHCID 69515759{5-Methyl-6-[5-(4-chloro-phenyl)-isoxazol-3-ylmethoxy]-benzo[b]thiophen-3-yl}-acetic acid methyl ester

Product 1

HCID 225048432-(6-((5-(4-Chlorophenyl)isoxazol-3-yl)methoxy)-5-methylbenzo[b]thiophen-3-yl)acetic acidYield 99%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

Compound 79A (0.03 g, 0.07 mmol) from the preceding step was dissolved in 2-3 mL of tetrahydrofuran, an equal volume of 2N KOH was added, and the mixture stirred at room temp. After 18 hours 75 mL of icewater was added and the mixture was acidified with H3PO4. After 30 min the precipitate was filtered off, rinsed 3× with water, and dried. The product was triturated in 4N HCl, allowed to stand for an hour, then filtered off, rinsed with water then ethanol, and dried to afford 0.01 g (99%) of the title compound as a white powder; mp 198-200° C. (dec). MS m/z 413 (M). Synthesis of {6-[5-(4-Trifluoromethyl-phenyl)-isoxazol-3-ylmethoxy]-benzofuran-3-yl}-acetic acid (Compound 80) Step 1. Preparation of {6-[5-(4-Trifluoromethyl-phenyl)-isoxazol-3-ylmethoxy]-benzofuran-3-yl}-acetic acid methyl ester (Compound 80A)

Workup

  1. additionAfter 18 hours 75 mL of icewater was added
  2. filtrationAfter 30 min the precipitate was filtered off
  3. washrinsed 3× with water
  4. customdried
  5. customThe product was triturated in 4N HCl
  6. waitto stand for an hour
  7. filtrationfiltered off
  8. washrinsed with water
  9. dry with materialethanol, and dried

Sources & evidence

ORD record
ord-392ac451dd9440889e2e9b491eacc56f
Source dataset
uspto-grants-2005_04
Patent number
US06875780B2

Reaction notes

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