Sodium Carbonate → (S)-methyl 2-(2-(3-bromophenyl)-7-chloro-5-methylpyrazolo[1,5-a]pyrimidin-6-yl)-2-hydroxyacetate

HRID 1400723Notes

Reaction equation

HRID 1400723 reaction equation
[Br:1][C:2]1[CH:3]=[C:4]([C:8]2[CH:24]=[C:11]3[N:12]=[C:13]([CH3:23])[C:14]([C:17](=[O:22])[C:18]([O:20][CH3:21])=[O:19])=[C:15]([Cl:16])[N:10]3[N:9]=2)[CH:5]=[CH:6][CH:7]=1.CB1N2CCC[C@@H]2C(C2C=CC=CC=2)(C2C=CC=CC=2)O1.C1(C)C=CC=CC=1.C([O-])([O-])=O.[Na+].[Na+]>C1(C)C=CC=CC=1.CCOC(C)=O>[Br:1][C:2]1[CH:3]=[C:4]([C:8]2[CH:24]=[C:11]3[N:12]=[C:13]([CH3:23])[C:14]([C@H:17]([OH:22])[C:18]([O:20][CH3:21])=[O:19])=[C:15]([Cl:16])[N:10]3[N:9]=2)[CH:5]=[CH:6][CH:7]=1

Participants

6

Reactant 3

HCID 10340Sodium CarbonateHCID 86670277(R)-1-methyl-3,3-diphenylhexahydropyrrolo[1,2-c][1,3,2]oxazaborole tolueneHCID 86710774Methyl 2-(2-(3-bromophenyl)-7-chloro-5-methylpyrazolo[1,5-a]pyrimidin-6-yl)-2-oxoacetate

Product 1

HCID 86710773(S)-methyl 2-(2-(3-bromophenyl)-7-chloro-5-methylpyrazolo[1,5-a]pyrimidin-6-yl)-2-hydroxyacetateYield 85.2%

Reagents, catalysts & solvents 2

HCID 1140TolueneSolvent2×HCID 8857Ethyl AcetateSolvent

Conditions

Temperature
-35 °C

Procedure

To a stirred solution of methyl 2-(2-(3-bromophenyl)-7-chloro-5-methylpyrazolo[1,5-a]pyrimidin-6-yl)-2-oxoacetate (14 g, 34.3 mmol) in anhydrous toluene (400 mL) was added 1.1M (R)-1-methyl-3,3-diphenylhexahydropyrrolo[1,2-c][1,3,2]oxazaborole/toluene (12.5 mL, 13.7 mmol). The mixture was cooled to −35° C. and then a 4.17M solution of catechoborane/toluene (11.7 mL, 48 mmol) was added over the course of 10 min. After 30 min, the reaction mixture was slowly warmed to −15° C. and stirred for additional 2 h. At this point the reaction mixture was diluted with EtOAc (300 mL) and treated with sat.aq. Na2CO3 (50 mL). The mixture was stirred vigorously for 10 min. The organic phase was separated and washed with sat. aq. Na2CO3 (5×100 mL), 0.1N HCl (1×100 mL), and brine. The organic phase was dried (Na2SO4), filtered, and concentrated. The residue was triturated with ether to obtain 12 g (77%) of the desired (S)-methyl 2-(2-(3-bromophenyl)-7-chloro-5-methylpyrazolo[1,5-a]pyrimidin-6-yl)-2-hydroxyacetate as a colorless oil. 1H NMR (400 MHz, CDCl3) δ 8.20 (t, J=1.8 Hz, 1H), 7.95 (dq, J=7.8, 0.8 Hz, 1H), 7.57 (ddd, J=8.0, 2.0, 1.0 Hz, 1H), 7.37 (t, J=7.9 Hz, 1H), 6.95 (s, 1H), 5.79 (s, 1H), 3.87 (s, 3H), 3.59 (d, J=1.8 Hz, 1H), 2.65 (s, 3H). LCMS (M+H)=410 and 412.

Workup

  1. temperaturethe reaction mixture was slowly warmed to −15° C.
  2. additiontreated with sat.aq
  3. stirringThe mixture was stirred vigorously for 10 min
  4. customThe organic phase was separated
  5. washwashed with sat. aq. Na2CO3 (5×100 mL), 0.1N HCl (1×100 mL), and brine
  6. dry with materialThe organic phase was dried (Na2SO4)
  7. filtrationfiltered
  8. concentrationconcentrated
  9. customThe residue was triturated with ether

Sources & evidence

ORD record
ord-633f5aa37a714fab8a72794f4c65996a
Source dataset
uspto-grants-2014_12
Patent number
US08906929B2

Reaction notes

Loading…