反应详情

0.5 ml of Triethylamine was added to a solution of 200 mg of 2,6-dimethyl-5-(3-methyl-2-butenyloxycarbonyl)-4-(3,4,5-trimethoxyphenyl)-dihydropyrimidine in 5 ml of tetrahydrofuran (THF) and 2-heptyl chloroformate dissolved in 6 ml of THF was added dropwise. The 2-heptyl chloroformate was prepared by adding 0.25 ml of N,N-diethylaniline dissolved in 2 ml of THF to a solution of 0.15 g of 2-heptyn-1-ol and 0.1 mg of trichloromethyl chloroformate in 4 ml of THF in a separate reaction vessel. After stirring at room temperature for 1 hr, the reaction mixture was concentrated under reduced pressure. The residue was purified on silica gel by column chromatography (silica gel 20 g, eluant:benzene/ethyl acetate 9:1) to obtain 187 mg (69% yield) of title product.

1. additionwas added dropwise
2. concentrationthe reaction mixture was concentrated under reduced pressure
3. customThe residue was purified on silica gel by column chromatography (silica gel 20 g, eluant:benzene/ethyl acetate 9:1)