1,9-Bis(N,N-dimethylaminomethyl)dipyrromethanes in the synthesis of porphyrins bearing one or two meso substituents
摘要:
A synthesis of 5,15-disubstituted zinc-porphyrins has been developed that employs condensation of a 1,9-bis(N,N-dimethylaminomethyl)dipyrromethane+a dipyrromethane in refluxing ethanol containing zinc acetate followed by oxidation with DDQ. The NN-dimethylaminomethylation of the dipyrromethane was achieved via Eschenmoser's reagent (N,N-dimethylmethyleneammonium iodide) in CH2Cl2 at room temperature. The synthesis is compatible with diverse substituents (e.g., alkyl, aryl, ester, acetal) and enables rapid synthesis of trans-AB-, A(2)-, and A-porphyrins. The synthesis of > 40 zinc porphyrins has been surveyed; 13 zinc porphyrins were isolated in yields of 5-20% without detectable scrambling. (c) 2005 Elsevier Ltd. All rights reserved.
Methods and intermediates for the synthesis of porphyrins
申请人:Lindsey S. Jonathan
公开号:US20070027312A1
公开(公告)日:2007-02-01
A method of making a porphyrin (I) is carried out by condensing (i) a bis(imino)dipyrromethane of Formula II:
with (ii) a dipyrromethaneto produce a reaction product; then (b) optionally oxidizing said reaction product with an oxidizing agent; and then (c) optionally demetallating said reaction product to produce the porphyrin. Methods of making compounds of Formula II are also described.
Efficient Dipyrrin-Centered Phosphorescence at Room Temperature from Bis-Cyclometalated Iridium(III) Dipyrrinato Complexes
作者:Kenneth Hanson、Arnold Tamayo、Vyacheslav V. Diev、Matthew T. Whited、Peter I. Djurovich、Mark E. Thompson
DOI:10.1021/ic100633w
日期:2010.7.5
series of seven dipyrrin-based bis-cyclometalated Ir(III) complexes have been synthesized and characterized. All complexes display a single, irreversible oxidation wave and at least one reversible reduction wave. The electrochemical properties were found to be dominated by dipyrrin centered processes. The complexes were found to display room temperature luminescence with emission maxima ranging from 658
A method of making chlorins comprises the steps of reacting (e.g. condensing) a dipyrrin western half intermediate with an eastern half intermediate to form a tetrahydrobilene, and then cyclizing the tetrahydrobilene to form a chlorin. Intermediates including tetrahydrobilenes useful in such reactions are also described.
The reaction of pyrrole/furan aldehyde with Grignard reagent and pyrrole/N-methyl pyrrole in sequence allows efficient synthesis of a number of meso-elaborated bis(heterocyclyl)methanes, which are otherwise difficult to obtain through a direct aldehyde condensation route.