Tetrabutylammonium Fluoride → (2S)-ethyl 2-(2-amino-7-(8-fluoro-5-methylchroman-6-yl)-5-methylpyrazolo[1,5-a]pyrimidin-6-yl)-2-(tert-butoxy)acetate

HRID 1468749Notes

Reaction equation

HRID 1468749 reaction equation
[C:1]([O:5][C@@H:6]([C:12]1[C:13]([CH3:43])=[N:14][C:15]2[N:16]([N:30]=[C:31]([NH:33]C(OCC[Si](C)(C)C)=O)[CH:32]=2)[C:17]=1[C:18]1[C:19]([CH3:29])=[C:20]2[C:25](=[C:26]([F:28])[CH:27]=1)[O:24][CH2:23][CH2:22][CH2:21]2)[C:7]([O:9][CH2:10][CH3:11])=[O:8])([CH3:4])([CH3:3])[CH3:2].CCCC[N+](CCCC)(CCCC)CCCC.[F-]>C1COCC1>[NH2:33][C:31]1[CH:32]=[C:15]2[N:14]=[C:13]([CH3:43])[C:12]([C@H:6]([O:5][C:1]([CH3:3])([CH3:2])[CH3:4])[C:7]([O:9][CH2:10][CH3:11])=[O:8])=[C:17]([C:18]3[C:19]([CH3:29])=[C:20]4[C:25](=[C:26]([F:28])[CH:27]=3)[O:24][CH2:23][CH2:22][CH2:21]4)[N:16]2[N:30]=1

Participants

4

Reactant 2

HCID 2724141Tetrabutylammonium FluorideHCID 86695369(2S)-ethyl 2-tert-butoxy-2-(7-(8-fluoro-5-methylchroman-6-yl)-5-methyl-2-((2-(trimethylsilyl)ethoxy)carbonylamino)pyrazolo[1,5-a]pyrimidin-6-yl)acetate

Product 1

HCID 86695370(2S)-ethyl 2-(2-amino-7-(8-fluoro-5-methylchroman-6-yl)-5-methylpyrazolo[1,5-a]pyrimidin-6-yl)-2-(tert-butoxy)acetateYield 85.2%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

A mixture of (2S)-ethyl 2-tert-butoxy-2-(7-(8-fluoro-5-methylchroman-6-yl)-5-methyl-2-((2-(trimethylsilyl)ethoxy)carbonylamino)pyrazolo[1,5-a]pyrimidin-6-yl)acetate (2.3 g, 3.74 mmol), 1M TBAF (4.49 mL, 4.49 mmol) in THF (20 mL) was stirred at rt for 3 h. It was then concentrated, diluted with water, and extracted with EtOAc. The organic phase was washed with water, dried over MgSO4, filtered and concentrated to yield 1.5 g (85%) of (2S)-ethyl 2-(2-amino-7-(8-fluoro-5-methylchroman-6-yl)-5-methylpyrazolo[1,5-a]pyrimidin-6-yl)-2-(tert-butoxy)acetate as a oil which solidified upon standing for one day. 1H NMR (500 MHz, CDCl3) δ 6.87 (d, J=10.56 Hz, 1H), 5.88 (s, 1H), 4.85 (s, 1H), 4.33 (t, J=5.04 Hz, 2H), 4.08-4.14 (m, 4H), 2.76 (t, J=6.38 Hz, 2H), 2.71 (s, 3H), 2.13-2.21 (m, 2H), 1.87 (s, 3H), 1.20 (t, J=7.17 Hz, 3H), 1.16 (s, 9H). LCMS (M+H)=471.36.

Workup

  1. concentrationIt was then concentrated
  2. additiondiluted with water
  3. extractionextracted with EtOAc
  4. washThe organic phase was washed with water
  5. dry with materialdried over MgSO4
  6. filtrationfiltered
  7. concentrationconcentrated

Sources & evidence

ORD record
ord-444bc25021b940d7b076c1fc5d7e1528
Source dataset
uspto-grants-2015_04
Patent number
US09006235B2

Reaction notes

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