取代5-羟基硫代-7h-硫代[3,2-g][1]苯并噻吩吡喃-7-ones的简易合成

G. Chandramouli, P. Reddy, B. Prassana
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引用次数: 0

摘要

Lewis酸(BF 3 (OEt) 2)在干乙醚中介导取代的2-(2-甲基-3-甲基磺酰-苯基磺酰)-1,2-二苯基乙烷(3a-e)在室温下环化和去甲基化得到7-甲基-2,3-二苯基-6-硫苯[b]噻吩(4a-e)。用取代丙二酸处理(4a-e)得到相应的取代5-羟基硫代- 7h -硫代[3,2-g][1]苯并噻吩吡喃-7-aones。通过元素、IR、1h NMR和质谱分析对其进行了表征。
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Facile synthesis of substituted 5-hydroxythio-7h-thieno[3,2-g] [1]benzothiopyran-7-ones
Lewis acid (BF 3 (OEt) 2 ) in dry diethyl ether mediated cyclization and demethylation of substituted 2-(2-methyl-3-methylsulfanyl-phenylsulfanyl)-1,2-diphenyl-ethanones (3a-e) at ambient temperature gave 7-methyl-2,3-diphenyl-6-thio-benzo[b]thiophenes (4a-e). Treatment of (4a-e) with substituted malonic acids furnishes the corresponding substituted 5-hydroxythio-7H-thieno[3,2-g][1] benzothiopyran-7-aones. These were characterized by their elemental, IR, 1 H NMR and mass spectral analysis.
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