First intramolecular Diels–Alder reactions using chromone derivatives: synthesis of chromeno[3,4-<i>b</i>]xanthones and 2-(benzo[<i>c</i>]chromenyl)chromones
作者:Hélio M. T. Albuquerque、Clementina M. M. Santos、José A. S. Cavaleiro、Artur M. S. Silva
DOI:10.1039/c7nj05185a
日期:——
A series of novel (E)-2-(2-propargyloxystyryl)chromones and (E,E)-2-[4-(2-propargyloxyphenyl)buta-1,3-dien-1-yl]chromones were designed and synthesized via aldol condensation of 2-methylchromones with 2-propargyloxy(benzaldehyde and cinnamaldehyde), respectively. Both chromone derivatives were used as substrates in microwave-assisted intramolecular Diels–Alder reactions, affording chromeno[3,4-b]xanthones
设计并合成了一系列新颖的(E)-2-(2-炔丙基氧基苯乙烯基)色酮和(E,E)-2- [4-(2-丙炔氧基苯基)丁-1,3-二烯-1-基]色酮通过2-甲基色酮与2-炔丙基氧基(苯甲醛和肉桂醛)的醛醇缩合反应。两种色酮衍生物均用作微波辅助的分子内Diels-Alder反应的底物,提供色酚[3,4- b ]氧杂蒽和2-(苯并[ c ]色烯基)色酮。这是第一个涉及分子内Diels-Alder反应中色酮衍生物用于合成新的氧杂环化合物的化合物,即氧杂蒽酮和黄酮类化合物。