Ultrasound in Baylis–Hillman reactions with aliphatic and aromatic aldehydes: scope and limitations
作者:Fernando Coelho、Wanda P. Almeida、Demetrius Veronese、Cristiano R. Mateus、Elizandra C. Silva Lopes、Rodrigo C. Rossi、Gabriel P.C. Silveira、César H. Pavam
DOI:10.1016/s0040-4020(02)00822-0
日期:2002.9
The utilization of ultrasound radiation in the Baylis–Hillman reaction with several aldehydes (aromatics and aliphatics) and different α,β-unsaturated reactants is described. For all aldehydes tested, the utilization of ultrasound sources augmented the reaction rate and the chemical yields. The use of ultrasound with two different catalysts (tri-n-butylphosphine and 1,4-diazabicyclo[2.2.2]octane [DABCO])
描述了超声波在Baylis-Hillman反应中与几种醛(芳族化合物和脂族化合物)以及不同的α,β-不饱和反应物的利用。对于所有测试的醛,超声源的利用提高了反应速率和化学收率。超声的用两种不同的催化剂的使用(三- Ñ丁基膦和1,4-二氮杂双环[2.2.2]辛烷[DABCO])还研究。据清楚地表明,DABCO是用于催化超声的影响比是三下的Baylis-Hillman反应更有效Ñ丁基膦。当DABCO的浓度增加时,未观察到对反应速率的影响。