作者:Patrick J. Rauen、Timothy D. Lash
DOI:10.1016/j.tetlet.2020.152662
日期:2020.12
A pyrrole ethyl ester with a fused dihydropyracylene unit was prepared by reacting 5-nitro-1,2-dihydropyracylene with ethyl isocyanoacetate in the presence of a phosphazene base. Cleavage of the ester moiety, followed by reaction with an acetoxymethylpyrrole and acetic acid in refluxing ethanol, afforded a tripyrrane, and subsequent ‘3 + 1’ condensation with a pyrrole dialdehyde gave a dihydropyracyloporphyrin
通过使5-硝基-1,2-二氢吡喃基与异氰基乙酸乙酯在磷腈碱的存在下反应,制备具有稠合的二氢吡喃基单元的吡咯乙酯。酯部分的切割,然后与乙酰氧基甲基吡咯和乙酸在回流的乙醇中反应,得到三吡喃,随后与吡咯二醛的“ 3 +1”缩合得到二氢吡喃卟啉。二氢吡并吡咯与苯甲醛和BF 3的环四聚反应。Et 2 O给出了空间拥挤的四(二氢嘧啶基)-卟啉,并且还原的五元环被证明是构象迁移率的出色NMR探针。新的卟啉及其镍(II)配合物还显示出潜在有价值的高红移UV-vis光谱。