Recyclable organotungsten Lewis acid and microwave assisted Diels–Alder reactions in water and in ionic liquids
作者:I-Hon Chen、Jun-Nan Young、Shuchun Joyce Yu
DOI:10.1016/j.tet.2004.09.078
日期:2004.12
water-soluble, organotungsten Lewis acid, [OP(2-py)3W(CO)(NO)2](BF4)2 (1), was synthesized and characterized. A series of 1-catalyzed Diels–Alder reactions were investigated under conventional heating or microwave heating conditions. The cycloaddition reactions were efficiently conducted in either water or in an ionic liquid, 1-butyl-3-methylimidazolium hexafluorophosphate. The ionic liquid acts as a powerful
合成并表征了水溶性有机钨路易斯酸[OP(2-py)3 W(CO)(NO)2 ](BF 4)2(1)。在常规加热或微波加热条件下,研究了一系列1催化的Diels–Alder反应。环加成反应在水或离子液体六氟磷酸1-丁基-3-甲基咪唑鎓中有效进行。离子液体不仅用作提高速率和选择性的有力介质,而且还有助于促进催化剂的循环利用。与热加热相比,观察到通过微波闪蒸加热的剧烈速率加速。