New Porphyrinoid Diimines by Cyclization of 1,9-Bis(5-formylpyrrol-2-yl)-dipyrrins with Arene-1,2-diamines and Hydrazines
作者:Stephan Seggewies、Thomas Schönemeier、Eberhard Breitmaier
DOI:10.1055/s-1999-3453
日期:1999.4
Four new porphyrinoid diimines 3, 4, 5 and 6 are synthesized from alkylated 1,9-bis(5-formylpyrrol-2-yl)dipyrrins 1 and diaminobenzidine 2a, hydrazine (2b), N,N′-diaminoguanidine (2c) and 3,4-diaminopyridine (2d). Macrocycles 4 and 5 resist oxidation with DDQ (2,3-dichloro-5,6-dicyanobenzoquinone) to 18Ï or 22Ï aromatic systems, while 3 and 6 are readily obtained as aromatic macrocycles. From the latter, 6 exhibits deshielded protons outside and shielded NH protons inside due to 22Ï aromaticity.
由烷基化的 1,9-双(5-甲酰基吡咯-2-基)二吡咯啉 1 和二氨基联苯胺 2a、肼 (2b)、N,N′-二氨基胍 (2c) 以及 3,4-二氨基吡啶 (2d) 合成了四种新的卟吩二亚胺 3、4、5 和 6。大环 4 和 5 可通过 DDQ(2,3-二氯-5,6-二氰基苯醌)氧化成 18Ï 或 22Ï 芳香族体系,而 3 和 6 则很容易得到芳香族大环。从后者来看,由于 22Ï芳香性,6 在外部表现出去屏蔽质子,而在内部则表现出屏蔽 NH 质子。