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The synthesis of 2- and 3-aryl indoles and 1,3,4,5-tetrahydropyrano[4,3-b]indoles and their antibacterial and antifungal activity
Bioorganic & Medicinal Chemistry Letters ( IF 2.5 ) Pub Date : 2009-07-22 , DOI: 10.1016/j.bmcl.2009.07.091
Tlabo C. Leboho , Joseph P. Michael , Willem A.L. van Otterlo , Sandy F. van Vuuren , Charles B. de Koning

A series of 2- and 3-aryl substituted indoles and two 1,3,4,5-tetrahydropyrano[4,3-b]indoles were synthesized from indole and 5-methoxyindole. The 2-aryl indoles were synthesized from the 1-(phenylsulfonyl)indole derivatives using magnesiation followed by iodination. The 2-iodinated compounds were then subjected to Suzuki–Miyaura reactions. In addition, the 3-aryl indoles were made from the corresponding 3-bromoindoles using Suzuki–Miyaura reactions. The 1,3,4,5-tetrahydropyrano[4,3-b]indoles were also synthesized from 1-(phenylsulfonyl)indole by magnesiation followed by treatment with allylbromide. The product was then converted into [2-allyl-1-(phenylsulfonyl)-1H-indol-3-yl]methanol which upon exposure to Hg(OAc)2 and NaBH4 afforded tetrahydropyrano[4,3-b]indoles. A number of the 2- and 3-aryl indoles displayed noteworthy antimicrobial activity, with compound 13a displaying the most significant activity (3.9 μg/mL) against the Gram-positive micro-organism Bacillus cereus.



中文翻译:

2-和3-芳基吲哚和1,3,4,5-四氢吡喃并[4,3- b ]吲哚的合成及其抗菌和抗真菌活性

由吲哚和5-甲氧基吲哚合成了一系列2-和3-芳基取代的吲哚和两个1,3,4,5-四氢吡喃并[4,3- b ]吲哚。使用镁化然后碘化由1-(苯磺酰基)吲哚衍生物合成2-芳基吲哚。然后将2-碘代化合物进行Suzuki-Miyaura反应。另外,使用Suzuki-Miyaura反应由相应的3-溴吲哚制备3-芳基吲哚。1,3,4,5-四氢吡喃并[4,3- b ]吲哚也由1-(苯磺酰基)吲哚通过镁化然后用烯丙基溴处理而合成。然后将产物转化为[2-烯丙基-1-(苯磺酰基)-1 H-吲哚-3-基]甲醇,将其暴露于Hg(OAc)2和NaBH4得到四氢吡喃并[4,3- b ]吲哚。许多2-和3-芳基吲哚显示出值得注意的抗菌活性,化合物13a对革兰氏阳性微生物蜡样芽胞杆菌显示出最显着的活性(3.9μg/ mL)。

更新日期:2009-07-22
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