Synthesis of 2,4-disubstituted furans and 4,6-diaryl-substituted 2,3-benzo-1,3a,6a-triazapentalenes
作者:Alan R. Katritzky、Deniz Hur、Kostyantyn Kirichenko、Yu Ji、Peter J. Steel
DOI:10.3998/ark.5550190.0005.208
日期:——
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.
酰基乙炔1a-h与苯并三唑2的反应得到中间体3a-h。在碱存在下用三甲基碘化锍处理 3a-h 得到中间体环氧乙烷 4a-h 和 2,3-苯并-1,3a,6a-三氮杂戊烯 7d-g,这取决于取代基。粗品 4a-h 的酸催化重排得到 2,4-二取代呋喃 5a-h。