Synthesis of Substituted Coumarins via Brønsted Acid Mediated Condensation of Allenes with Substituted Phenols or Anisoles
作者:Sundae Kim、Dongjin Kang、Chang-Hee Lee、Phil Ho Lee
DOI:10.1021/jo301086k
日期:2012.8.3
Coumarins were obtained from the condensation of electron-rich arenes with allenes in the presence of TfOH in good yield. Depending on the substituent pattern of allenes employed, the general synthetic method of 4-substituted and 3,4-disubstituted 3-arylcoumarins has been developed. Readily available allenes were employed as the three-carbon atom sources constituting the coumarin skeleton.
在TfOH存在下,富电子芳烃与丙二烯的缩合可得到香豆素。根据所用的烯的取代基样式,已经开发了4-取代和3,4-二取代的3-芳基香豆素的一般合成方法。使用现成的丙二烯作为构成香豆素骨架的三碳原子源。