Dichloromethane → Methyl 2-(2-bromo-7-chloro-5-methylpyrazolo[1,5-a]pyrimidin-6-yl)-2-tert-butoxyacetate

HRID 574341Notes

Reaction equation

HRID 574341 reaction equation
[Br:1][C:2]1[CH:18]=[C:5]2[N:6]=[C:7]([CH3:17])[C:8]([CH:11]([OH:16])[C:12]([O:14][CH3:15])=[O:13])=[C:9]([Cl:10])[N:4]2[N:3]=1.C(Cl)Cl.Cl(O)(=O)(=O)=O>C(OC(C)(C)C)(=O)C>[Br:1][C:2]1[CH:18]=[C:5]2[N:6]=[C:7]([CH3:17])[C:8]([CH:11]([O:16][C:8]([CH3:11])([CH3:9])[CH3:7])[C:12]([O:14][CH3:15])=[O:13])=[C:9]([Cl:10])[N:4]2[N:3]=1

Participants

5

Reactant 3

HCID 6344DichloromethaneHCID 24247Perchloric AcidHCID 86670271Methyl 2-(2-bromo-7-chloro-5-methylpyrazolo[1,5-a]pyrimidin-6-yl)-2-hydroxyacetate

Product 1

HCID 86670272Methyl 2-(2-bromo-7-chloro-5-methylpyrazolo[1,5-a]pyrimidin-6-yl)-2-tert-butoxyacetateYield 120%

Reagents, catalysts & solvents 1

HCID 10908tert-Butyl acetateSolvent

Procedure

To a suspension of methyl 2-(2-bromo-7-chloro-5-methylpyrazolo[1,5-a]pyrimidin-6-yl)-2-hydroxyacetate (80 mg, 0.239 mmol) in tert-butyl acetate (2 mL) at room temperature was added CH2Cl2 (2 mL) followed by perchloric acid (0.022 mL, 0.359 mmol). The reaction mixture was stirred for 4 h at room temperature. The reaction mixture was quenched with water and diluted with ethyl acetate. The organic phase was washed with saturated NaHCO3 and dried over sodium sulfate. The solvent was evaporated. Purification by silica gel chromatography provided the title compound (56 mg, 59.9%). 1H NMR (500 MHz, MeOD) δ 1.27 (9 H, s), 2.62 (3 H, s), 3.74 (3 H, s), 5.75 (1 H, s), 6.75 (1 H, s).

Workup

  1. customThe reaction mixture was quenched with water
  2. additiondiluted with ethyl acetate
  3. washThe organic phase was washed with saturated NaHCO3
  4. dry with materialdried over sodium sulfate
  5. customThe solvent was evaporated
  6. customPurification by silica gel chromatography

Sources & evidence

ORD record
ord-685702c337b24c2faf6126a573f08962
Source dataset
uspto-grants-2015_05
Patent number
US09034882B2

Reaction notes

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