Cesium carbonate → (S)-4-[3-(tert-Butyldimethylsilanyloxy)-2-methylpropyl]-6-methoxy-4H-benzo[1,4]oxazin-3-one

HRID 2103193Notes

Reaction equation

HRID 2103193 reaction equation
[CH3:1][O:2][C:3]1[CH:4]=[CH:5][C:6]2[O:11][CH2:10][C:9](=[O:12])[NH:8][C:7]=2[CH:13]=1.Br[CH2:15][C@@H:16]([CH3:26])[CH2:17][O:18][Si:19]([C:22]([CH3:25])([CH3:24])[CH3:23])([CH3:21])[CH3:20].C([O-])([O-])=O.[Cs+].[Cs+]>CCCCCCC.CCOC(C)=O>[Si:19]([O:18][CH2:17][C@@H:16]([CH3:26])[CH2:15][N:8]1[C:7]2[CH:13]=[C:3]([O:2][CH3:1])[CH:4]=[CH:5][C:6]=2[O:11][CH2:10][C:9]1=[O:12])([C:22]([CH3:23])([CH3:24])[CH3:25])([CH3:20])[CH3:21]

Participants

5

Reactant 3

HCID 10796Cesium carbonateHCID 11032834(S)-3-bromo-2-methylpropoxy-tert-butyldimethylsilaneHCID 132049526-methoxy-3,4-dihydro-2H-1,4-benzoxazin-3-one

Product 1

HCID 68912948(S)-4-[3-(tert-Butyldimethylsilanyloxy)-2-methylpropyl]-6-methoxy-4H-benzo[1,4]oxazin-3-oneYield 80%

Reagents, catalysts & solvents 1

HCID 21899848Ethylacetate heptaneSolvent

Procedure

6-Methoxy-4H-benzo[1,4]oxazin-3-one (111MF24) (2.7 g, 15.1 mmol), (S)-3-bromo-2-methylpropoxy-tert-butyldimethylsilane (4.03 g, 15.1 mmol) and Cs2CO3 (12.3 g, 38 mmol) were mixed according to GP7. CC (SiO2; Heptane/EtOAc 9:1) to give the title compound (111MF32) (4.03 g, 80%). 1H NMR (CDCl3) δ 6.89 (d, J=8.8 Hz, 1H), 6.71 (d, J=2.8 Hz, 1H), 6.50 (dd, J=2.8 Hz, J=8.6 Hz, 1H), 4.53 (q, J=14.8 Hz, J=29.2 Hz, 2H), 3.98 (dd, J=8.8 Hz, J=14.0 Hz, 1H), 3.85 (dd, J=5.8 Hz, J=14.2 Hz, 1H), 3.77 (s, 3H), 3.57 (dd, J=9.2 Hz, J=10.0 Hz, 1H), 3.47 (dd, J=7.2 Hz, J=10.0 Hz, 1H), 2.20-2.12 (m, 1H), 0.91 (s, 12H), 0.05 (d, J=1.2 Hz, 6H); 13C NMR (CDCl3) δ 165.3, 155.6, 139.7, 129.8, 117.2, 107.4, 103.3, 68.0, 66.2, 55.9, 43.9, 34.3, 26.1, 18.5, 14.7, −5.3, −5.4.

Sources & evidence

ORD record
ord-13744869f97e4009b29ce3efc272c35a
Source dataset
uspto-grants-2009_08
Patent number
US07576100B2

Reaction notes

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