The Friedel-Crafts acylation of 2-(biphenyl-4-yl)-5-phenyl-1,3,4-oxadiazole (PBD) with hippuryl chloride has been used to prepare the derivative V which on cyclization with POCl3 or P4S10 gives the respective oxazole (or thiazole) derivative of PBD, XIa or XIb. The reaction of carboxylic acid II with 4-(o-aminoacetyl)biphenyl in the presence of CDI gives N-acyl-α-aminoketone VII; the analogous compound VI has been prepared by acylating of o-aminoacetophenone with acyl chloride III. The cyclization of these compounds gives bifluorophores Xa - Xd.
对2-(
联苯基-4-基)-5-苯基-
1,3,4-噁二唑(
PBD)进行弗里德尔-克拉夫斯酰化反应,使用
对甲基苯甲酰氯制备衍
生物V,该衍
生物在与POCl3或
P4S10环化反应后形成
PBD的相应
噁唑(或
噻唑)衍
生物XIa或XIb。将
羧酸II与4-(o-
氨基乙酰)
联苯在
CDI存在下反应,得到N-酰基-α-
氨基酮VII;类似的化合物VI通过对o-
氨基
苯乙酮与酰
氯III进行酰化反应制备。这些化合物的环化反应形成双
氟光团Xa - Xd。