A DDQ-mediated ring-opening and aromatization cascade of a tetrahydrocarbazole-fused tetrahydrofuran for the synthesis of olivacine
作者:Ömer Dilek、Süleyman Patir、Tahir Tilki、Erkan Ertürk
DOI:10.1016/j.tetlet.2023.154603
日期:2023.7
It is introduced that an N-MOM-tetrahydrocarbazole-fused tetrahydrofuran is a new intermediate for the synthesis of olivacine. Upon treatment with DDQ in a mixture of H2O-THF at 80 °C, it undergoes ring-opening, MOM-removal and aromatization in one pot to yield 1-methyl-carbazole-2-ethanol, an already known precursor for olivacine. Besides, several common transformations, such as α-alklylation of N-MOM-protected
据介绍,N -MOM-四氢咔唑稠合四氢呋喃是合成橄榄新碱的新型中间体。在 80 °C 的 H 2 O-THF混合物中用 DDQ 处理后,它在一个锅中经历开环、MOM 去除和芳构化,产生 1-甲基-咔唑-2-乙醇,这是一种已知的 olivacine 前体. 此外,一些常见的转化,如N -MOM-保护的四氢咔唑-1-酮与溴乙酸乙酯的α-烷基化,以及内酯与Red-Al还原为四氢呋喃,都得到了很好的利用。