Synthesis of Linear and Tripoidal Oligo(phenylene ethynylene)-Based Building Blocks for Application in Modular DNA-Programmed Assembly
摘要:
Rigid linear and tripoidal organic modules based on the oligo(phenylene ethynylene) backbone having salicylaldehyde-derived termini are synthesized. A highly functionalized 5-iodosalicyl aldehyde was prepared and coupled to each ethynyl group of 1,4-diethynylbenzene or 1,3,5-triethynylbenzene in Sonogashira couplings. The two or three termini of the compounds are functionalized for incorporation in linear and branched oligonucleotide strands. For the linear module (LM), the two termini are equipped with amide spacers, and one of these was functionalized with a DMTr (dimethoxytrityl)-protected hydroxy group and the other with a phosphoramidite. One of the tripoidal modules is prepared with DMTr groups in two of its three termini. A tripoidal module is also synthesized with three different groups on its hydroxy termini: a phosphoramidite, a DMTr group, and an Fmoc group. Extended studies have shown that these rigid linear and tripoidal organic modules can be incorporated into short oligonucleotides. Several of these modules can be applied for DNA-directed assembly and covalent coupling into structures of predetermined connectivity. Such structures have potential application for molecular electronics and nanotechnology.
Synthesis of Linear and Tripoidal Oligo(phenylene ethynylene)-Based Building Blocks for Application in Modular DNA-Programmed Assembly
摘要:
Rigid linear and tripoidal organic modules based on the oligo(phenylene ethynylene) backbone having salicylaldehyde-derived termini are synthesized. A highly functionalized 5-iodosalicyl aldehyde was prepared and coupled to each ethynyl group of 1,4-diethynylbenzene or 1,3,5-triethynylbenzene in Sonogashira couplings. The two or three termini of the compounds are functionalized for incorporation in linear and branched oligonucleotide strands. For the linear module (LM), the two termini are equipped with amide spacers, and one of these was functionalized with a DMTr (dimethoxytrityl)-protected hydroxy group and the other with a phosphoramidite. One of the tripoidal modules is prepared with DMTr groups in two of its three termini. A tripoidal module is also synthesized with three different groups on its hydroxy termini: a phosphoramidite, a DMTr group, and an Fmoc group. Extended studies have shown that these rigid linear and tripoidal organic modules can be incorporated into short oligonucleotides. Several of these modules can be applied for DNA-directed assembly and covalent coupling into structures of predetermined connectivity. Such structures have potential application for molecular electronics and nanotechnology.
A macromolecular architecture suitable for use in molecular electronics. And in the manufacture of conductors and semi-conductors has been synthesised using linear and branched oligomers of organic molecules. The incorporation of a bi-or tri-functional organic compound in an oligonucleotide chain and the application of these for formation of covalently linked organic and metal-organic oligomers has led to a novel molecular architecture. Furthermore, the iterative serial synthesis of linear and branched organic oligomers by automated methods such as DNA-synthesis or peptide synthesis, using bi- or tri-functional organic monomers is described herein. The novel compounds may be used to position and arrange nanoscale substrates such as biomolecules, biological structures, colloids, supramolecular structures forming covalently linked assemblies for use as conducting wires and components in electronic devices.