4-Toluenesulfonyl chloride → HCID 86599120, compound

Participants

Reaction Steps

Treatment of 2-allyl-6-bromo-3,4-difluorophenol (5.0 g, 0.020 mol) with 3-chloroperoxybenzoic acid (77%, 8.1 g, 0.036 mol) followed by potassium carbonate (6.94 g, 0.050 mol) generally according to the procedure described for Intermediate 9 afforded (±)-(7-bromo-4,5-difluoro-2,3-dihydro-1-benzofuran-2-yl)methanol a brown oil. Treatment of the alcohol with diisopropylethylamine (2.57 g, 0.020 mol), p-toluenesulfonyl chloride (2.28 g, 0.012 mol), and 4-(dimethylamino)pyridine (0.29 g, 2.375 mmol) generally according to the procedure described for Intermediate 45 gave 2.9 g (35%) of (±)-(7-bromo-4,5-difluoro-2,3-dihydro-1-benzofuran-2-yl)methyl 4-methylbenzenesulfonate as a white solid. Rf=0.46 (silica, ethyl acetate:hexanes 1:3); 1H NMR (DMSO-d6) δH 7.73 (d, 2H); 7.50 (dd, 1H); 7.43 (d, 2H); 5.15 (m, 1H); 4.3 (dd, 1H); 4.22 (dd, 1H); 3.45 (dd, 1H); 3.08 (dd, 1H).

Provenance & Evidence