Regioselective Synthesis of Thieno[3,2-c][1]benzopyran-4-ones by Thio-Claisen Rearrangement
作者:Krishna C. Majumdar、Anindita Biswas
DOI:10.1007/s00706-003-0164-4
日期:2004.8
A number of thieno[3,2- c ][1]benzopyran-4-ones, potential antiinflamatory, antipyretic, and antiallergic drugs, are synthesized in 65–80% yield by thermal thio- Claisen rearrangement of 4-allylthio[1]benzopyran-2-ones in refluxing quinoline for 0.5–8.0 h. The 4-allylthio[1]benzopyran-2-ones are in turn prepared in 75–85% yield from 4-mercaptocoumarin and different allylic halides by phase-transfer-catalysed
通过热硫代- 克莱森 重排4-allylthio [1] ,可以合成许多噻吩[3,2- c ] [1]苯并吡喃-4-酮,潜在的抗炎,解热和抗过敏药,产率为65-80%。 苯并吡喃-2-酮在喹啉中回流0.5–8.0小时。然后通过在氯仿水溶液中用 TBAB 或 BTEAC 催化剂进行相转移催化的烷基化反应,由4-巯基香豆素和不同的烯丙基卤化物以75-85%的收率制备4-allylthio [1]苯并吡喃-2-酮 。室温下的NaOH。