反应详情

7-Bromo-1,2-dihydrobenzofuran (64 mg, 0.3 mmol; Intermediate 77) and para-toluenesulfonic acid monohydrate (62 mg, 0.3 mmol) were mixed and then a 1:10 mixture (by weight) of methanesulfonic and phosphorous pentoxide (1 mL) was added. The resultant mixture was stirred over night at room temperature and was then poured onto ice/water. The obtained crystalline material was filtered and dried to give 120 mg of the title product. 1H NMR (400 MHz, CDCl3) δ 2.40 (s, 3H), 3.33 (t, 2H), 4.73 (t, 2H), 7.29 (d, 2H), 7.65 (d, 1H), 7.79 (d, 2H), 7.89 (d, 1H); GC-MS (EI+) for C15H13BrSO3 m/z 354 (M+H)+.

1. additionwas then poured onto ice/water
2. filtrationThe obtained crystalline material was filtered
3. customdried