Synthesis of 2,4-disubstituted furans and 4,6-diaryl-substituted 2,3-benzo-1,3a,6a-triazapentalenes

Synthesis of 2,4-disubstituted furans and 4,6-diaryl-substituted 2,3-benzo-1,3a,6a-triazapentalenes
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DOI:
10.3998/ark.5550190.0005.208
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发表时间:
2004-01-01
期刊:
影响因子:
0.9
通讯作者:
Steel, PJ
Steel, PJ
中科院分区:
化学4区
文献类型:
--
作者:
Katritzky, AR;Hür, D;Steel, PJ

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酰基乙炔1a-h与苯并三唑2反应得到中间体3a-h。3a-h与碘化三甲基锍在碱存在下反应,得到中间体环氧乙烷4a-h和2,3-苯并-1,3a,6a-三氮杂并环戊二烯7 d-g(取决于取代基)。粗品4a-h经酸催化重排得到2,4-二取代呋喃5a-h。
Reactions of acylacetylenes 1a-h with benzotriazole 2 give intermediates 3a-h. The treatment of 3a-h with trimethylsulfonium iodide in the presence of base give intermediate oxiranes 4a-h and 2,3-benzo-1,3a,6a-triazapentalenes 7d-g depending on substituent. Acid-catalyzed rearrangement of crude 4a-h give 2,4-disubstituted furans 5a-h.