Ethyl Acetate → HCID 22222345, compound

HRID 1782133Notes

Reaction equation

HRID 1782133 reaction equation
[CH2:1]([N:8]1[C:13](=[O:14])[C:12]2[C:15]([CH3:18])=[N:16][S:17][C:11]=2[N:10]=[C:9]1[CH2:19][CH2:20][CH3:21])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.C([O-])(=O)C.[Na+].[Br:27]Br.CCOC(C)=O>C(O)(=O)C>[CH2:1]([N:8]1[C:13](=[O:14])[C:12]2[C:15]([CH3:18])=[N:16][S:17][C:11]=2[N:10]=[C:9]1[CH:19]([Br:27])[CH2:20][CH3:21])[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1

Participants

6

Reactant 4

HCID 8857Ethyl AcetateHCID 24408BromineHCID 517045Sodium AcetateHCID 22222296HCID 22222296, compound

Product 1

HCID 22222345HCID 22222345, compoundYield 100%

Reagents, catalysts & solvents 1

HCID 176Acetic AcidSolvent2×

Procedure

To a solution of 5-benzyl-3-methyl-6-propyl-5H-isothiazolo[5,4-d]pyrimidin-4-one (method 8) (369 mg, 1.23 mmol) and sodium acetate (1 g) in acetic acid (5 mL) at 100° C., a solution of the bromine (318 mg, 2 mmol) in acetic acid (10 mL) was added dropwise over a period of 20 minutes. The reaction mixture was cooled after the addition and the TLC (eluent 10% EtOAc in hexanes) and MS showed the complete disappearance of the SM and only the product. The reaction mixture was poured into ice water and extracted with EtOAc (3×60 mL) and the organic layers were combined and washed with 2% sodium thiosulfate solution (60 mL), water (100 mL), brine (100 mL) and dried over Na2SO4. Concentration of the organic layer provided the pure 5-benzyl-6-(1-bromo-propyl)-3-methyl-5H-isothiazolo[5,4-d]pyrimidin-4-one, (460 mg, 100%) as white crystalline solid. 1H NMR (300 MHz) δ 0.76 (t, 3H), 2.1-2.47 (m, 2H), 2.84 (s, 3H), 4.62 (t, 1H), 4.88 (d, 1H), 6.20 (d, 1H), 7.10-7.40 (m, 5H).

Workup

  1. temperatureThe reaction mixture was cooled
  2. additionafter the addition
  3. extractionextracted with EtOAc (3×60 mL)
  4. washwashed with 2% sodium thiosulfate solution (60 mL), water (100 mL), brine (100 mL)
  5. dry with materialdried over Na2SO4

Sources & evidence

ORD record
ord-8ed2462266734bb4ae4329e9ba4b1ad9
Source dataset
uspto-grants-2009_03
Patent number
US07498333B2

Reaction notes

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