Boron Trifluoride-Mediated Cycloaddition of 3-Bromotetrazine and Silyl Enol Ethers: Synthesis of 3-Bromo-pyridazines,The Journal of Organic Chemistry

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Boron Trifluoride-Mediated Cycloaddition of 3-Bromotetrazine and Silyl Enol Ethers: Synthesis of 3-Bromo-pyridazines
The Journal of Organic Chemistry ( IF 3.3 ) Pub Date : 2021-08-03 , DOI: 10.1021/acs.joc.1c01384
Simon D Schnell ₁ , Jorge A González ₁ , Jan Sklyaruk ₁ , Anthony Linden ₁ , Karl Gademann ₁

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Pyridazines are important scaffolds for medicinal chemistry or crop protection agents, yet the selective preparation of 3-bromo-pyridazines with high regiocontrol remains difficult. We achieved the Lewis acid-mediated inverse electron demand Diels–Alder reaction between 3-monosubstituted s-tetrazine and silyl enol ethers and obtained functionalized pyridazines. In the case of 1-monosubstituted silyl enol ethers, exclusive regioselectivity was observed. Downstream functionalization of the resulting 3-bromo-pyridazines was demonstrated utilizing several cross-coupling protocols to synthesize 3,4-disubstituted pyridazines with excellent control over the substitution pattern.

中文翻译：

三氟化硼介导的 3-溴四嗪和甲硅烷基烯醇醚的环加成反应：3-溴哒嗪的合成

哒嗪是药物化学或作物保护剂的重要支架，但选择性制备具有高区域控制的 3-溴哒嗪仍然很困难。我们实现了 3-单取代s-四嗪和甲硅烷基烯醇醚之间的路易斯酸介导的逆电子需求 Diels-Alder 反应，并获得了功能化的哒嗪。在 1-单取代的甲硅烷基烯醇醚的情况下，观察到排他性区域选择性。所得 3-溴-哒嗪的下游功能化利用几种交叉偶联方案来合成 3,4-二取代哒嗪，并能很好地控制取代模式。

更新日期：2021-09-03

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