Ethyl Acetate → HCID 54757411, compound

HRID 1782166Notes

Reaction equation

HRID 1782166 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][CH:20]([CH3:22])[CH3:21])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.C([O-])(=O)C.[Na+].[Br:28]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:28])[CH:20]([CH3:22])[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 54757317HCID 54757317, compound

Product 1

HCID 54757411HCID 54757411, compoundYield 100.2%

Reagents, catalysts & solvents 1

HCID 176Acetic AcidSolvent2×

Procedure

To a solution of 5-benzyl-6-isobutyl-3-methyl-5H-isothiazolo[5,4-d]pyrimidin-4-one (method 27) (5.81 g, 18.5 mmol) and sodium acetate (10 g) in acetic acid (100 ml) at 100° C., a solution of the bromine (6 g, 38 mmol) in acetic acid (60 ml) was added dropwise over a period of 20 minutes. The reaction mixture was stirred at that temperature for 30 min and cooled 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 5-benzyl-6-(1-bromo-2-methyl-propyl)-3-methyl-5H-isothiazolo[5,4-d]pyrimidin-4-one (7.27 g, 99%) as white crystalline solid. 1H NMR (300 MHz) δ 0.54 (d, 3H), 1.11 (d, 3H), 2.62-2.76 (m, 1H), 2.83 (s, 3H), 4.42 (d, 1H), 4.80 (d, 1H), 6.22 (d, 1H), 7.12-7.42 (m, 5H).

Workup

  1. temperaturecooled
  2. extractionextracted with EtOAc (3×60 ml)
  3. washwashed with 2% sodium thiosulfate solution (60 ml), water (100 ml), brine (100 ml)
  4. dry with materialdried over Na2SO4

Sources & evidence

ORD record
ord-6605a993f30949919462471c05ae8a0c
Source dataset
uspto-grants-2009_03
Patent number
US07498333B2

Reaction notes

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