反应详情

A solution of Compound 401 (6.5 g), PPTS (0.73 g) and 3,4-dihydro-2H-pyran (2 g) in dichloromethane (33 ml) was stirred at r.t. for 17 h. Dichloromethane (250 ml) was added and the solution was washed with brine (250 ml). Work-up with chromatography with ether/pentane 1:1 (v/v) gave the title compound (7.1 g). 1H NMR: 0.85 (t, 6H), 1.55 (q, 4H), 1.42-1.90 (m, 6H), 2.45 (s, 3H), 3.47 (m, 1H), 3.89 (m, 1H), 4.79 (s, 2H), 4.85 (m, 1H), 7.35 (d, 2H), 7.82 (d, 2H) .

1. washthe solution was washed with brine (250 ml)