Efficient synthesis of novel bis(arylmethylidenes) of the 2,2-dimethyl-1,3-dithian-5-one system
作者:M. Saeed Abaee、Fereshteh Mahmoudi、Soodabeh Forghani、Mohammad M. Mojtahedi、Klaus Harms
DOI:10.1080/17415993.2015.1130131
日期:2016.5.3
a zirconium salt in water, 2,2-dimethyl-1,3-dithian-5-one undergoes double aldol condensation with two folds of aromatic aldehydes at 50oC to yield the respective bisarylmethylidene derivatives efficiently within 2 h. The products precipitate in the reaction mixtures spontaneously, perhaps due to high polarity of the medium, avoiding time-consuming and expensive chromatographic separations. Thus, products
摘要 在由催化量的二乙胺、十二烷基硫酸钠和锆盐在水中组成的混合物中,2,2-二甲基-1,3-二噻烷-5-酮在 50oC 下与两倍的芳香醛发生双羟醛缩合反应,得到在 2 小时内有效地产生相应的双芳基亚甲基衍生物。产物在反应混合物中自发沉淀,这可能是由于介质的高极性,避免了耗时且昂贵的色谱分离。因此,通过简单的过滤和从乙酸乙酯中重结晶很容易分离产物,而滤液成功地循环用于后续反应。图形概要