tert-Butyl acetate → HCID 86670278, compound

HRID 472835Notes

Reaction equation

HRID 472835 reaction equation
[Cl:1][C:2]1[N:7]2[N:8]=[C:9]([C:11]3[CH:16]=[CH:15][CH:14]=[C:13]([Cl:17])[CH:12]=3)[CH:10]=[C:6]2[N:5]=[C:4]([CH3:18])[C:3]=1[C@H:19]([OH:24])[C:20]([O:22][CH3:23])=[O:21].C(O[C:29]([CH3:32])([CH3:31])[CH3:30])(=O)C.Cl(O)(=O)(=O)=O>C(Cl)Cl>[C:29]([O:24][C@@H:19]([C:3]1[C:4]([CH3:18])=[N:5][C:6]2[N:7]([N:8]=[C:9]([C:11]3[CH:16]=[CH:15][CH:14]=[C:13]([Cl:17])[CH:12]=3)[CH:10]=2)[C:2]=1[Cl:1])[C:20]([O:22][CH3:23])=[O:21])([CH3:32])([CH3:31])[CH3:30]

Participants

5

Reactant 3

HCID 10908tert-Butyl acetateHCID 24247Perchloric AcidHCID 86670276(S)-methyl 2-(7-chloro-2-(3-chlorophenyl)-5-methylpyrazolo[1,5-a]pyrimidin-6-yl)-2-hydroxyacetate

Product 1

HCID 86670278HCID 86670278, compoundYield 50%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

To a solution of (S)-methyl 2-(7-chloro-2-(3-chlorophenyl)-5-methylpyrazolo[1,5-a]pyrimidin-6-yl)-2-hydroxyacetate (1.0 g, 2.73 mmol) in CH2Cl2 (100 mL) at room temperature was added tert-butyl acetate (20 mL) followed by perchloric acid (0.282 mL, 3.28 mmol). The reaction mixture was stirred for 16 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 (520 mg, 50%). 1H NMR (400 MHz, CHLOROFORM-d) δ 8.07-8.00 (m, 1H), 7.89 (dt, J=6.7, 1.9 Hz, 1H), 7.48-7.37 (m, 2H), 6.93 (s, 1H), 5.68 (s, 1H), 3.75 (s, 3H), 2.69 (s, 3H), 1.29 (s, 9H).

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-6024ceb0540a42dcabffff8da0687811
Source dataset
uspto-grants-2014_01
Patent number
US08633200B2

Reaction notes

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