Hydrochloric Acid → 2-Fluoropyridine-3-boronic acid
反応式
[Li]CCCC.[F:6][C:7]1[CH:12]=[CH:11][CH:10]=[CH:9][N:8]=1.[B:13](OC)([O:16]C)[O:14]C.Cl>C1COCC1.O.C1COCC1>[F:6][C:7]1[C:12]([B:13]([OH:16])[OH:14])=[CH:11][CH:10]=[CH:9][N:8]=1[Li]CCCC.[F:6][C:7]1[CH:12]=[CH:11][CH:10]=[CH:9][N:8]=1.[B:13](OC)([O:16]C)[O:14]C.Cl>C1COCC1.O.C1COCC1>[F:6][C:7]1[C:12]([B:13]([OH:16])[OH:14])=[CH:11][CH:10]=[CH:9][N:8]=1800 ml (1.28 mol) of n-BuLi (1.6M in hexane) are added to a solution of 188 ml (1.32 mol) of TMP in 1,000 ml of THF at -78° C. under argon. After the mixture has been stirred for 45 minutes at this temperature, 120.4 g (1.24 mol) of 2-fluoropyridine in 200 ml of THF are added in the course of 3 minutes. After the mixture has been stirred for 4 hours at -78° C., a solution of 128.8 g (1.24 mol) of trimethyl borate in 200 ml of THF is added dropwise in the course of 20 minutes. Then, 200 ml of a 1: 1 mixture of water/THF is added at 25° C., and 256 ml of concentrated HCl are added dropwise, with ice-cooling. The organic phase is separated off, and the aqueous phase is washed twice using Et2O, filtered and concentrated in vacuo. Crude yield 148.2 g.
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