推挽式氨基酮与原位生成的邻醌甲基甲酸酯的反应:合成3-酰基-4 H-色烯和2-酰基-1 H-苯并[ f ]色烯作为羟苄基杂环化合物的前体
摘要:
已经开发了一种简单有效的方法,可以由邻醌甲基化物前体和推挽式烯酮合成吡喃环中含有三氟乙酰基或芳酰基的4 H-苯二甲基和1 H-苯并[ f ]苯二甲基。苯并二氢吡喃酮可能是通过最初的Oxa-Diels-Alder反应形成,然后消除胺而形成的。已经证明给定的色烯进一步转化为邻羟基苄基化的吡唑,异恶唑和吡啶的可能性。
Transition Metal Catalyzed Oxidations; 4.<sup>1</sup>Improved Method for the Oxidation of 1- and 2-Naphthols to 1,2-Napthoquinones
作者:Karsten Krohn、Hagen Rieger、Kai Brüggmann
DOI:10.1055/s-1990-27116
日期:——
A specific oxidation of 1- and 2-naphthols to the corresponding 1,2-naphthoquinones can be achieved by slow addition of the preformed complex of the naphthols with titanium tetraisopropylate with a syringe pump to excess tert-butyl hydroperoxide (TBHP). A previously described method gave mainly coupling products from the Michael reaction.
Oxa-[3+3] annulation of 1H-benzo[f]chromene-2-carbaldehydes and 2-naphthols: synthesis of 7aH,15H-benzo[f]benzo[5,6]chromeno[2,3-b]chromenes
作者:Irina А. Semenova、Vitaly А. Osyanin、Dmitry V. Osipov、Yuri N. Klimochkin
DOI:10.1007/s10593-021-02968-6
日期:2021.6
A method for the preparation of polycondensed chromeno[2,3-b]chromenes was developed based on the formal [3+3] cycloaddition reaction between 1H-benzo[f]chromene-2-carbaldehydes and 2-naphthols. In the case of resorcinol, the bisannulation product formed with the participation of both hydroxy groups was isolated.
基于1H-苯并[ f ]色烯-2-甲醛和2-萘酚之间的正式[3+3]环加成反应,开发了一种制备缩聚色烯[2,3- b ]色烯的方法。在间苯二酚的情况下,分离出两个羟基参与形成的双环化产物。