Highly Chemoselective Multicomponent Biginelli-Type Condensations of Cycloalkanones, Urea or Thiourea and Aldehydes
作者:Yu-lin Zhu、Shen-lin Huang、Yuan-jiang Pan
DOI:10.1002/ejoc.200400845
日期:2005.6
The classical Biginelli reaction is considerably extended by use of cycloalkanones instead of 1,3-dicarbonyl compounds. Use of TMSCl as a Lewis acid allowed one-pot chemoselective multicomponent Biginelli reactions between cycloalkanones, urea or thiourea, and aldehydes. Under similar reaction conditions, thiourea exhibited different behavior to urea, and aliphatic aldehydes showed lower reactivity
通过使用环烷酮代替 1,3-二羰基化合物,可以大大扩展经典的 Biginelli 反应。使用 TMSCl 作为路易斯酸允许在环烷酮、尿素或硫脲和醛之间进行一锅化学选择性多组分 Biginelli 反应。在相似的反应条件下,硫脲表现出与尿素不同的行为,脂肪醛的反应性低于芳香醛。提出了解释该反应的可能机制。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)