A new synthetic route to 5-arylbenzo[c]xanthones is established. This was accomplished by use the Heck reaction of 3-bromoflavones with styrene derivatives, leading to (E)-3-styrylflavones with total diastereoselectivity. This transformation was greatly improved under microwave irradiation. The one-pot, photoinduced electrocyclisation of (E)-3-styrylflavones and further in situ oxidation of the cycloadduct leads to 5-arylbenzo[c]xanthones.
                                    建立了一条合成5-芳基苯并[c]咕吨酮的新路线。通过利用
3-溴黄酮与
苯乙烯衍
生物的Heck反应,实现了立体选择性极高的(E)-3-
苯乙烯基
黄酮的合成。在微波照射下,这一转化得到了极大改善。通过(E)-3-
苯乙烯基
黄酮的一锅法光诱导电环化反应,并进一步原位氧化环加成产物,得到了5-芳基苯并[c]咕吨酮。