3,4-dihydro-2H-pyran → HCID 69689153, compound

HRID 1265609Notes

Reaction equation

HRID 1265609 reaction equation
[CH3:1][O:2][C:3](=[O:18])[C:4]1[CH:9]=[CH:8][CH:7]=[C:6]([C:10]2O[C:12]([CH2:15][CH2:16][OH:17])=[N:13][N:14]=2)[CH:5]=1.[O:19]1[CH:24]=[CH:23][CH2:22][CH2:21][CH2:20]1.O.C1(C)C=CC([S:32](O)(=O)=O)=CC=1>CCOC(C)=O>[CH3:1][O:2][C:3](=[O:18])[C:4]1[CH:9]=[CH:8][CH:7]=[C:6]([C:10]2[S:32][C:12]([CH2:15][CH2:16][O:17][CH:24]3[CH2:23][CH2:22][CH2:21][CH2:20][O:19]3)=[N:13][N:14]=2)[CH:5]=1

Participants

5

Reactant 3

HCID 80803,4-dihydro-2H-pyranHCID 521998p-Toluenesulfonic acid monohydrateHCID 69688087HCID 69688087, compound

Product 1

HCID 69689153HCID 69689153, compound

Reagents, catalysts & solvents 1

HCID 8857Ethyl AcetateSolvent2×

Conditions

Temperature
20 °C

Procedure

A mixture of 3-[5-(2-hydroxy-ethyl)-[1,3,4]oxadiazol-2-yl]-benzoic acid methyl ester (7.45 g), dihydropyrane (4.1 mL) and p-toluenesulfonic acid hydrate (0.57 g) in AcOEt (80 mL) was stirred at 20° C. for 2 h. The solution was diluted with AcOEt, washed with 5% NaHCO3 solution and with brine, dried and evaporated in vacuum. The residual oil was purified by chromatography on silica gel using AcOEt/hexane (1:2) as eluent to give 3-{5-[2-(tetrahydro-pyran-2-yloxy)-ethyl]-[1,3,4]thiadiazol-2-yl}-benzoic acid methyl ester (8.2 g) as a pale-yellow oil.

Workup

  1. washwashed with 5% NaHCO3 solution and with brine
  2. customdried
  3. customevaporated in vacuum
  4. customThe residual oil was purified by chromatography on silica gel

Sources & evidence

ORD record
ord-e8ecdd3f21754020b4e0217898a7a330
Source dataset
uspto-grants-2003_04
Patent number
US06544985B2

Reaction notes

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