Sodium Carbonate → Ethyl 2-(3-methoxyphenyl)thiazole-4-carboxylate

HRID 460184Notes

Reaction equation

HRID 460184 reaction equation
[CH3:1][O:2][C:3]1[CH:4]=[C:5](B(O)O)[CH:6]=[CH:7][CH:8]=1.Br[C:13]1[S:14][CH:15]=[C:16]([C:18]([O:20][CH2:21][CH3:22])=[O:19])[N:17]=1.C([O-])([O-])=O.[Na+].[Na+]>COCCOC.C1C=CC(P(C2C=CC=CC=2)[C-]2C=CC=C2)=CC=1.C1C=CC(P(C2C=CC=CC=2)[C-]2C=CC=C2)=CC=1.Cl[Pd]Cl.[Fe+2]>[CH3:1][O:2][C:3]1[CH:4]=[C:5]([C:13]2[S:14][CH:15]=[C:16]([C:18]([O:20][CH2:21][CH3:22])=[O:19])[N:17]=2)[CH:6]=[CH:7][CH:8]=1

Participants

6

Reactant 3

HCID 10340Sodium CarbonateHCID 353965Ethyl 2-bromo-1,3-thiazole-4-carboxylateHCID 2734370(3-Methoxyphenyl)boronic acid

Product 1

HCID 15170573Ethyl 2-(3-methoxyphenyl)thiazole-4-carboxylate

Reagents, catalysts & solvents 2

HCID 178418228Bis(cyclopenta-1,4-dien-1-yl(diphenyl)phosphane);dichloropalladium;iron(2+)CatalystHCID 80711,2-DimethoxyethaneSolvent

Procedure

A suspension of 3-methoxyphenyl boronic acid (0.25 g, 1.65 mmol), ethyl 2-bromothiazole-4-carboxylate (0.33 g, 1.4 mmol), PdCl2(dppf)2 (0.11 g) and 2M Na2CO3 (aq) (2 mL) in DME (10 mL) was heated to reflux for 20 h. The mixture was cooled to RT, filtered, concentrated by rotary evaporation and purified on silica gel (6:1 hexanes/EtOAc and 4:1 hexanes/EtOAc) to afford the title compound as a light-brown oil. EI-MS m/z 264 (M+H).

Workup

  1. temperaturewas heated
  2. temperatureto reflux for 20 h
  3. filtrationfiltered
  4. concentrationconcentrated by rotary evaporation
  5. custompurified on silica gel (6:1 hexanes/EtOAc and 4:1 hexanes/EtOAc)

Sources & evidence

ORD record
ord-ad5b006cf87046c88715381f603200ae
Source dataset
uspto-grants-2007_03
Patent number
US07196104B2

Reaction notes

Loading…