反应详情

温度

0 °C

A mixture of 35% potassium hydride in oil (6.04 g, equivalent to 2.11 g, 53 mmol of potassium hydride) in 240 ml of sieve dried tetrahydrofuran was cooled to 0° C. The cold mixture was treated with homoterephthalic acid dimethyl ester (10.0 g, 48 mmol). The mixture was stirred at 0° C. for 1 hour. Methyl iodide (7.51 g, 53 mmol) was added and the mixture stirred at 0° C. for 30 min, then at room temperature for 16 hours. The resulting mixture was treated with 4.8 ml of 50% acetic acid, then poured into 480 ml of water. The mixture was extracted with ether (2×250 ml). The ether extracts were combined, dried on magnesium sulfate, and concentrated to a brown oil, 15.67 g. Chromatography on 250 g of flash silica gel (10% ether in hexanes eluent) gave the product VII-2 as a pale yellow oil, 7.24 g (67.9% theory).

1. stirringthe mixture stirred at 0° C. for 30 min
2. waitat room temperature for 16 hours
3. extractionThe mixture was extracted with ether (2×250 ml)
4. customdried on magnesium sulfate
5. concentrationconcentrated to a brown oil, 15.67 g
6. customChromatography on 250 g of flash silica gel (10% ether in hexanes eluent) gave the product VII-2 as a pale yellow oil, 7.24 g (67.9% theory)