Dimethylformamide → 2-chloro-5-(MethoxyMethoxy)pyridine
反応式
[H-].[Na+].[Cl:3][C:4]1[N:9]=[CH:8][C:7]([OH:10])=[CH:6][CH:5]=1.[O:11]1[CH2:15]CC[CH2:12]1.CN(C)C=O.COCCl>O>[Cl:3][C:4]1[CH:5]=[CH:6][C:7]([O:10][CH2:12][O:11][CH3:15])=[CH:8][N:9]=1[H-].[Na+].[Cl:3][C:4]1[N:9]=[CH:8][C:7]([OH:10])=[CH:6][CH:5]=1.[O:11]1[CH2:15]CC[CH2:12]1.CN(C)C=O.COCCl>O>[Cl:3][C:4]1[CH:5]=[CH:6][C:7]([O:10][CH2:12][O:11][CH3:15])=[CH:8][N:9]=1
Sodium hydride, 60% dispension in mineral oil (3:2, Sodium hydride:Mineral Oil, 2.32 g) was added portion wise to a solution of 6-Chloro-pyridin-3-ol (5.00 g, 38.6 mmol) in a mixture of Tetrahydrofuran (10.0 mL, 123 mmol) and N,N-Dimethylformamide (20.0 mL, 258 mmol). The mixture formed was stirred for 15 min and Chloromethyl Methyl Ether (3.66 mL, 48.2 mmol) was added dropwise. The above mixture was stirred for 6 hours (monitored by LCMS), poured into water and extracted with ethyl acetate. The organic extracts were washed with water, brine, dried over MgSO4 and concentrated in vacuum. Purified on 40 g silica column eluting with 10-40% ethyl acetate in heptane to give 6.33 g of 2-chloro-5-(methoxymethoxy)pyridine.
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