作者:Heinz-Jürgen Bertram、Stefan Böhm、Liborius Born
DOI:10.1055/s-1991-26611
日期:——
A Novel Reaction of 4-Hydroxycoumarins and Synthesis of 4-Fluorocoumarins 6-Chlorohydroxycoumarins dimerise on reaction with sulfur(IV) fluoride to 6,8′-dichloro-2,2,4,4-tetrafluoro-4′-oxospiro[2H-1-benzopyran-3(4H), 2′(4′H)-[1]benzopyrano[3,4-d][1,3]oxathiazole]. The novel 4-Fluorocoumarins are obtained from the corresponding 4-Chlorocoumarins by an halogen-exchange reaction.
4-Hydroxycoumarins 的新反应和 4-Fluorocoumarins 的合成 6-氯羟基香豆素与氟化硫(IV)反应生成 6、8′-dichloro-2,2,4,4-tetrafluoro-4′-oxospiro[2H-1-benzopyran-3(4H), 2′(4′H)-[1]benzopyrano[3,4-d][1,3]oxathiazole].新型 4-氟香豆素是通过卤素交换反应从相应的 4-氯香豆素中获得的。