A metal-free one-pot synthesis of benzo[c]chromen-6-ones from 3,4-dichlorocoumarins and butadienes using tandem photo-thermal-photo reactions
作者:Yan Zhang、Yan Tian、Pei Xiang、Ning Huang、Jianyi Wang、Jian-Hua Xu、Min Zhang
DOI:10.1039/c6ob01701k
日期:——
of biologically valuable benzo[c]chromen-6-ones is achieved using a tandem photo-thermal-photo reaction sequence starting from 3,4-dichlorocoumarins and a 1,3-butadiene. In this concise one-pot protocol, neither metal catalyst nor peroxide promoter is needed and the products can be purified through simple recrystallization in most cases. The synthesis consists of a reaction sequence of photo-induced
使用从3,4-二氯香豆素和1,3-丁二烯开始的串联光热反应过程,可以有效,简单,通用地合成具有生物学价值的苯并[ c ] chromen-6-one。在这种简洁的一锅法方案中,不需要金属催化剂或过氧化物促进剂,并且在大多数情况下,可以通过简单的重结晶来纯化产物。合成过程包括光诱导的[4 + 2]和[2 + 2]环加成反应的顺序,硅胶促进的HCl消除和电环环丁烯开环,然后进行光诱导的6π电环化。用一系列二氯香豆素和一些典型的丁二烯可以很好地进行反应,从而以70-80%的产率提供相应的环状产物。