反应详情

To a stirred, room temperature solution of 3-dodecyl-5-isoxazole acetic acid (0.64 g, 0.0022 mol) in dry tetrahydrofuran (20 mL) under nitrogen was added in one portion, 1,1-carbonyldiimidazole (0.38 g, 0.0024 mol), and the mixture was stirred for 2 hours. To this solution was added 2,4,6-trimethoxyaniline hydrochloride (0.48 g, 0.0022 mol) and triethylamine (0.33 mL, 0.0024 mol) in THF (30 mL). The mixture was stirred for 2 days and allowed to cool. The solution was rotoevaporated and the residue dissolved in dichloromethane. The solid was filtered through silica gel (77 g, 70-230 mesh) using petroleum ether-acetone (4:1, 35×75 mL) and the filtrate rotoevaporated to an oil. The oil was dried in vacuo. The oil crystallized to give a pale yellow waxy solid; yield 0.96 g (96%); mp 107°-109° C.

1. stirringThe mixture was stirred for 2 days
2. temperatureto cool
3. filtrationThe solid was filtered through silica gel (77 g, 70-230 mesh)
4. customThe oil was dried in vacuo
5. customThe oil crystallized
6. customto give a pale yellow waxy solid