反应详情

A solution of thiophene-2-carbaldehyde (2.24 g) in anhydrous toluene was cooled to 0° C. under nitrogen inert-gas atmosphere and a solution of lithium hexamethyldisilazane (LiHMDS, 22 ml, 1.1 equiv.) was added via cannula over a 30 min period. The reaction mixture was allowed to warm up to room temperature for 2 h. After cooling to 0° C. again a solution of 3,5-dimethylbenzylmagnesium chloride (50 ml, ca. 1.5 equiv.) in tetrahydrofuran (THF) was added within 10 min and the reaction mixture allowed to warm up to room temperature and stirring continued for 3 h. This solution was quenched with aqueous potassium carbonate solution (5%) and extracted with diethyl ether. The dried and concentrated ether extracts were purified by column chromatography to give the product (1.4 g) as a yellowish oil in 30% yield.

1. additionwas added within 10 min
2. temperatureto warm up to room temperature
3. customThis solution was quenched with aqueous potassium carbonate solution (5%)
4. extractionextracted with diethyl ether
5. customThe dried
6. customconcentrated ether extracts were purified by column chromatography