反应详情

A mixture of 5-hydroxymethyl-2-pyrrolidone (85.0 g), benzaldehyde (98.0 g), p-toluenesulfonic acid (1.6 g) and toluene (500 ml) was heated to reflux using a Dean-Stark water separator and an oil bath, with vigorous stirring. After nine hours, the collection of water stopped and the cooled reaction mixture was washed with 5% sodium bicarbonate solution (2×50 ml), saturated sodium bisulfide solution (4×50 ml), water (2×50 ml) and brine (1×50 ml). The toluene solution was dried over andydrous magnesium sulfate and the solvent removed on a rotary evaporator. The residue obtained was distilled, 145°-150° C./0.1 mm Hg to give the title compound as an oil (129.0 g). [α]D =+269.6° (chloroform; c=1). TLC single spot at Rf =0.5 (silica gel, ethyl acetae-hexane; 4:1 UV and iodine).

1. temperaturewas heated
2. temperatureto reflux
3. customthe collection of water
4. customthe cooled reaction mixture
5. washwas washed with 5% sodium bicarbonate solution (2×50 ml), saturated sodium bisulfide solution (4×50 ml), water (2×50 ml) and brine (1×50 ml)
6. dry with materialThe toluene solution was dried over andydrous magnesium sulfate
7. customthe solvent removed on a rotary evaporator
8. customThe residue obtained
9. distillationwas distilled, 145°-150° C./0.1 mm Hg