Cesium carbonate → (S)-6-(2-hydroxy-2-methylpropyl)-3-((S)-1-(4-(4-methyl-5-oxo-4,5-dihydropyrazin-2-yl)phenyl)ethyl)-6-phenyl-1,3-oxazinan-2-one

HRID 2045994Notes

Reaction equation

HRID 2045994 reaction equation
[OH:1][C:2]([CH3:35])([CH3:34])[CH2:3][C@@:4]1([C:28]2[CH:33]=[CH:32][CH:31]=[CH:30][CH:29]=2)[O:9][C:8](=[O:10])[N:7]([C@H:11]([C:13]2[CH:18]=[CH:17][C:16](B3OC(C)(C)C(C)(C)O3)=[CH:15][CH:14]=2)[CH3:12])[CH2:6][CH2:5]1.Cl[C:37]1[N:38]=[CH:39][C:40](=[O:44])[N:41]([CH3:43])[CH:42]=1.C([O-])([O-])=O.[Cs+].[Cs+]>O1CCOCC1.Cl[Pd](Cl)([P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1)[P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1>[OH:1][C:2]([CH3:34])([CH3:35])[CH2:3][C@@:4]1([C:28]2[CH:33]=[CH:32][CH:31]=[CH:30][CH:29]=2)[O:9][C:8](=[O:10])[N:7]([C@H:11]([C:13]2[CH:14]=[CH:15][C:16]([C:37]3[N:38]=[CH:39][C:40](=[O:44])[N:41]([CH3:43])[CH:42]=3)=[CH:17][CH:18]=2)[CH3:12])[CH2:6][CH2:5]1

Participants

6

Reactant 3

HCID 10796Cesium carbonateHCID 584852805-Chloro-1-methylpyrazin-2(1H)-oneHCID 59532385(S)-6-(2-hydroxy-2-methylpropyl)-6-phenyl-3-((S)-1-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)ethyl)-1,3-oxazinan-2-one

Product 1

HCID 44512093(S)-6-(2-hydroxy-2-methylpropyl)-3-((S)-1-(4-(4-methyl-5-oxo-4,5-dihydropyrazin-2-yl)phenyl)ethyl)-6-phenyl-1,3-oxazinan-2-oneYield 71.5%

Reagents, catalysts & solvents 2

HCID 178418476HCID 178418476, compoundCatalystHCID 312751,4-DioxaneSolvent

Procedure

A mixture of (S)-6-(2-hydroxy-2-methylpropyl)-6-phenyl-3-((S)-1-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)ethyl)-1,3-oxazinan-2-one (279 mg, 0.6 mmol) and 5-chloro-1-methyl-1H-pyrazin-2-one (70 mg, 0.5 mmol), Pd(Ph3P)2Cl2 (3 mg), and aq. Cs2CO3 solution (0.5 mL, 2M) in 1,4-dioxane (3 mL) was stirred at reflux for 2.5 h under N2. When the reaction was over, the mixture was washed with water, and extracted with EtOAc. The organic phase was washed with brine, dried over Na2SO4, filtered, and concentrated to give the crude product, which was purified by preparative TLC to give (S)-6-(2-hydroxy-2-methylpropyl)-3-((S)-1-(4-(4-methyl-5-oxo-4,5-dihydropyrazin-2-yl)phenyl)ethyl)-6-phenyl-1,3-oxazinan-2-one (165.1 mg, 34.6%). LC-MS Method 2 tR=1.107 min, m/z=404.1; 1H NMR (CDCl3): δ 1.11 (s, 3H), 1.18 (s, 3H), 1.54 (d, 3H), 2.35 (m, 4H), 2.87 (m, 1H), 3.62 (s, 3H), 5.69 (m, 1H), 7.05 (d, 2H), 7.34 (m, 5H), 7.45 (m, 1H), 7.50 (d, 2H), 8.25 (s, 1H).

Workup

  1. temperatureat reflux for 2.5 h under N2
  2. washwas washed with water
  3. extractionextracted with EtOAc
  4. washThe organic phase was washed with brine
  5. dry with materialdried over Na2SO4
  6. filtrationfiltered
  7. concentrationconcentrated
  8. customto give the crude product, which
  9. customwas purified by preparative TLC

Sources & evidence

ORD record
ord-058d792453974e59906b8d94b8b5391b
Source dataset
uspto-grants-2013_11
Patent number
US08592410B2

Reaction notes

Loading…