A Facile Synthesis of Highly Functionalized 4-Arylcoumarins via Kostanecki Reactions Mediated by DBU
作者:In-Taek Hwang、Sun-Ah Lee、Jin-Soo Hwang、Kee-In Lee
DOI:10.3390/molecules16086313
日期:——
An efficient synthesis of 4-arylcoumarins has been accomplished via Kostanecki reactions of 2-hydroxybenzophenones with acetic anhydride employing DBU at ambient temperature. Using the same strategy, several 2-acyloxybenzophenone derivatives were readily converted to 3,4-difunctionalized coumarins. This protocol offers a notable improvement in reaction conditions for coumarin synthesis and takes advantage of its synthetic capability, especially for highly functionalized 4-arylcoumarins with structural diversity.
2-hydroxybenzophenones 与乙酸酐的 Kostanecki 反应采用 DBU 在常温下进行,从而高效合成了 4-芳基香豆素。采用相同的策略,几种 2-乙酰氧基二苯甲酮衍生物很容易转化为 3,4-二官能化香豆素。该方案明显改善了香豆素合成的反应条件,并利用了其合成能力的优势,尤其适用于具有结构多样性的高官能度 4-芳基香豆素。