Dimethyl Sulfate → (1-Hydroxy-6-methoxy-4-methoxymethyl-1,3-dihydro-benzo[c][1,2]oxaborol-3-yl)-acetic acid ethyl ester

HRID 1798104노트

반응식

HRID 1798104 반응식
[CH2:1]([O:3][C:4](=[O:20])[CH2:5][CH:6]1[O:10][B:9]([OH:11])[C:8]2[CH:12]=[C:13]([OH:19])[CH:14]=[C:15]([CH2:16][O:17][CH3:18])[C:7]1=2)[CH3:2].[C:21]([O-])([O-])=O.[K+].[K+].COS(OC)(=O)=O>CC(C)=O.CCOC(C)=O>[CH2:1]([O:3][C:4](=[O:20])[CH2:5][CH:6]1[O:10][B:9]([OH:11])[C:8]2[CH:12]=[C:13]([O:19][CH3:21])[CH:14]=[C:15]([CH2:16][O:17][CH3:18])[C:7]1=2)[CH3:2]

참가 물질

6

반응물 3

HCID 6497Dimethyl SulfateHCID 11430Potassium CarbonateHCID 58292640(1,6-Dihydroxy-4-methoxymethyl-1,3-dihydro-benzo[c][1,2]oxaborol-3-yl)-acetic acid ethyl ester

생성물 1

HCID 58292600(1-Hydroxy-6-methoxy-4-methoxymethyl-1,3-dihydro-benzo[c][1,2]oxaborol-3-yl)-acetic acid ethyl ester수율 32%

시약·촉매·용매 2

HCID 180Acetone용매HCID 8857Ethyl Acetate용매

실험 절차

To a mixture of (1,6-dihydroxy-4-methoxymethyl-1,3-dihydro-benzo[c][1,2]oxaborol-3-yl)-acetic acid ethyl ester (0.18 g, 0.64 mmol) and K2CO3 (0.44 g, 3.2 mmol) in acetone was added Me2SO4 (0.16 g, 1.28 mmol). The mixture was stirred at room temperature for 16 hours then diluted with EtOAc. The organic extracts were washed with HCl (aq), dried and concentrated in vacuo. The residue was purified by silica gel flash column chromatography to give (1-hydroxy-6-methoxy-4-methoxymethyl-1,3-dihydro-benzo[c][1,2]oxaborol-3-yl)-acetic acid ethyl ester (0.060 g, 32%). 1H NMR (400 MHz, MeOD-d4) δ 7.08 (s, 1H), 6.99 (s, 1H), 5.62 (m, 1H), 5.50 (m, 2H), 4.08 (m, 2H), 3.80 (s, 3H), 3.37 (s, 3H), 3.12 (m, 1H), 2.17 (m, 1H), 1.20 (m, 3H).

후처리

  1. washThe organic extracts were washed with HCl (aq)
  2. customdried
  3. concentrationconcentrated in vacuo
  4. customThe residue was purified by silica gel flash column chromatography

출처 및 근거

ORD 기록
ord-63963e4e8abf4321be4162590248d573
출처 데이터셋
uspto-grants-2013_01
특허 번호
US08343944B2

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