[Br:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[CH2:12][CH:11]([CH2:13][OH:14])[O:10][N:9]=2)=[CH:4][CH:3]=1.C(N(CC)CC)C.[Si:22](Cl)([C:25]([CH3:28])([CH3:27])[CH3:26])([CH3:24])[CH3:23].O>CN(C)C1C=CN=CC=1.ClCCl>[Br:1][C:2]1[CH:3]=[CH:4][C:5]([C:8]2[CH2:12][CH:11]([CH2:13][O:14][Si:22]([C:25]([CH3:28])([CH3:27])[CH3:26])([CH3:24])[CH3:23])[O:10][N:9]=2)=[CH:6][CH:7]=1
(5RS)-[3-(4-Bromophenyl)-4,5-dihydroisoxazol-5-yl]methanol (6.0 g, 0.023 M, see Pharmacia & Upjohn WO 98-07708), triethyl amine (3.9 mL, 0.028 M), and 4-(dimethylamino)pyridine (0.56 g, 4.58 mM), were combined in dichloromethane (36 mL). A solution of tert-butyldimethylsilyl chloride (1 M in dichloromethane, 26 mL, 0.028 M) was added and the resulting mixture was stirred at room temperature for 16 h. The resulting mixture was poured into water and extracted with dichloromethane. The combined organics were dried (magnesium sulfate), filtered and evaporated. The crude material was purified by chromatography on silica gel using 50% ethyl acetate/hexanes to give 8.4 g of the desired product.
Wird geladen…
