反应详情

0.60 g (3.2 mmol) of the product of step 2 was dissolved in 50 mL of carbon tetrachloride, along with 0.54 g (3.5 mmol) of N-chloro succinimide and a catalytic amount of benzoyl peroxide. After refluxing for 20 hr, the solution was concentrated and filtered through a plug of silica gel eluting with 20% ethyl acetate:hexane. The resulting oil was contaminated with ˜10% of unreacted starting material and was used in the next step without further purification. NMR (200 MHz, CDCl3) δ 7.96 (m, 2H, ArH), 7.63 (m, 1H, ArH), 7.43 (m, 1H, ArH), 7.17 (m, 3H, ArH), 4.72 (s, 2H, CH2Cl).

1. temperatureAfter refluxing for 20 hr
2. concentrationthe solution was concentrated
3. filtrationfiltered through a plug of silica gel eluting with 20% ethyl acetate
4. customwas used in the next step without further purification