Diisopropylethylamine → (2R)-1-(2-methylbenzothiazol-5-yloxy)-3-{4-[2-(2-methylphenoxy)ethyl]piperazinyl}propan-2-ol

HRID 271229Notes

Reaction equation

HRID 271229 reaction equation
Br[CH2:2][CH2:3][O:4][C:5]1[CH:10]=[CH:9][CH:8]=[CH:7][C:6]=1[CH3:11].[CH3:12][C:13]1[S:14][C:15]2[CH:21]=[CH:20][C:19]([O:22][CH2:23][C@H:24]([OH:32])[CH2:25][N:26]3[CH2:31][CH2:30][NH:29][CH2:28][CH2:27]3)=[CH:18][C:16]=2[N:17]=1.CCN(C(C)C)C(C)C>CCO>[CH3:12][C:13]1[S:14][C:15]2[CH:21]=[CH:20][C:19]([O:22][CH2:23][C@H:24]([OH:32])[CH2:25][N:26]3[CH2:27][CH2:28][N:29]([CH2:2][CH2:3][O:4][C:5]4[CH:10]=[CH:9][CH:8]=[CH:7][C:6]=4[CH3:11])[CH2:30][CH2:31]3)=[CH:18][C:16]=2[N:17]=1

Participants

5

Reactant 3

HCID 81531DiisopropylethylamineHCID 16225721-(2-Bromoethoxy)-2-methylbenzeneHCID 29943216(2R)-1-(2-methylbenzothiazol-5-yloxy)-3-piperazinylpropan-2-ol

Product 1

HCID 11189927(2R)-1-(2-methylbenzothiazol-5-yloxy)-3-{4-[2-(2-methylphenoxy)ethyl]piperazinyl}propan-2-ol

Reagents, catalysts & solvents 1

HCID 702EthanolSolvent

Procedure

To a solution of 2-bromo-1-(2-methylphenoxy)ethane (1.09 g, 5.09 mmol, crude) in EtOH (15 mL) was added (2R)-3-(2-methylbenzothiazol-5-yloxy)-1-piperazinylpropan-2-ol as prepared in Example 3A (250 mg, 0.81 mmol) and DIEA (1.5 mL, 8.6 mmol). The solution was stirred at reflux for 14 hours. Upon cooling, the solution was concentrated to an oil and then purified on an Isco™ (100% EtOAc hold 2 min, 8 min. gradient to 20% MeOH/EtOAc, hold 10 min) to afford (2R)-1-(2-methylbenzothiazol-5-yloxy)-3-{4-[2-(2-methylphenoxy)ethyl]piperazinyl }propan-2-ol.

Workup

  1. temperatureat reflux for 14 hours
  2. temperatureUpon cooling
  3. concentrationthe solution was concentrated to an oil
  4. custompurified on an Isco™ (100% EtOAc hold 2 min, 8 min. gradient to 20% MeOH/EtOAc, hold 10 min)

Sources & evidence

ORD record
ord-f90e95623ee14c17b61aff24c4efa443
Source dataset
uspto-grants-2008_11
Patent number
US07452889B2

Reaction notes

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