已证明2-苯乙烯基色酮与芳烃的无过渡金属的Diels-Alder和串联Diels-Alder /氧化-芳香化反应在温和的反应条件下与多种底物一起进行。串联过程以中等至良好的产率提供了官能化的苯并[ c ]]吨酮衍生物。通过简单地改变反应气氛,该有效方案允许快速选择性地快速接近二氢苯并[ c ]黄酮和苯并[ c ]黄酮衍生物。
Synthesis of functionalized chromones via organocatalysis
摘要:
A facile and versatile organocatalytic approach to access 2-substituted and 2,3-disubstituted chromone derivatives under mild conditions was developed, which was effectively catalyzed by novel proline phenylsulphonylhydrazide or pyrrolidine. As a result, diversely functionalized chromones were obtained in up to 99% yield. In addition, further modification of the corresponding chromones afforded novel polycyclic chromones. (C) 2014 Elsevier Ltd. All rights reserved.
The phosphonyl radical generated from the reaction of manganese(III) acetate with diethyl phosphonate selectively adds to the 3-position of flavones and coumarins to afford phosphonylated products in moderate to good yields. manganeseacetate - phosphonylation - flavones - coumarins - dialkyl phosphonate - freeradical