Synthesis of Indenoporphyrins, Highly Modified Porphyrins with Reduced Diatropic Characteristics
作者:Timothy D. Lash、Breland E. Smith、Michael J. Melquist、Bradley A. Godfrey
DOI:10.1021/jo2006895
日期:2011.7.1
yield. The porphyrin gave a highly modified UV–vis absorption spectrum with three strong bands showing up in the Soret region and a series of Q bands that extended beyond 700 nm. The proton NMR spectrum also showed a significantly reduced diamagnetic ring current where the meso-protons gave resonances near 9.3 ppm instead of typical porphyrin values of 10 ppm. Nickel(II), copper(II), and zinc complexes
从2-茚满酮开始已经合成了与茚稠合的卟啉。丙酸中的苄基或叔丁基乙酰乙酸酯肟与2-茚满酮和锌粉的克诺尔型反应,可得到良好的茚并吡咯产率。用N治疗然后,-氯代琥珀酰亚胺产生8-氯代衍生物,并使它们与5-未取代的吡咯反应,得到结合有稠合的茚单元的二吡咯。苄基酯保护基的氢解作用提供了相关的二羧酸,但在MacDonald“ 2 + 2”反应条件下与二吡咯甲烷二醛缩合生成的目标茚并卟啉收率很低。但是,当将与茚基稠合的双吡咯与TFA-原甲酸三甲酯转化为相应的二醛,然后与双吡咯甲烷二羧酸反应时,分离出茚并卟啉的产率为26%。卟啉给出了高度修饰的UV-vis吸收光谱,在Soret区域显示了三个强带,并延伸了超过700 nm的一系列Q带。中质子产生的共振接近9.3 ppm,而不是典型的卟啉值10 ppm。还制备了镍(II),铜(II)和锌络合物,它们显示出不寻常的紫外可见吸收光谱,并具有红移的索雷特和Q吸收红