Highly Chemoselective Multicomponent Biginelli-Type Condensations of Cycloalkanones, Urea or Thiourea and Aldehydes
Yu-lin Zhu, Shen-lin Huang, Yuan-jiang Pan
European Journal of Organic Chemistry
Volume 2005, Issue 11, pages 2354–2367,
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http://dx.doi.org/10.1002/ejoc.200400845