Synthesis of bis-spermine dimers that are potent polyamine transport inhibitors
摘要:
A series of novel spermine dimer analogues was synthesized and assessed for their ability to inhibit spermidine transport into MDA-MB-231 breast carcinoma cells, Two spermine molecules were tethered via their N-1 primary amines with naphthalenedisulfonic acid, adamantanedicarboxylic acid and a series of aliphatic dicarboxylic acids. The linked spermine analogues were potent polyamine transport inhibitors and inhibited cell growth cytostatically in combination with a polyamine synthesis inhibitor. Variation in the linker length did not alter polyamine transport inhibition. The amount of charge on the molecule may influence the molecular interaction with the transporter since the most potent spermidine transport inhibitors contained 5-6 positive charges. (C) 2001 Elsevier Science Ltd. All rights reserved.
A method for the introduction of the 2'-O-[(triisopropylsilyl)oxy]methyl (=tom) group into N-acetylated, 5'-O-dimethoxytritylated ribonucleosides is presented. The corresponding 2'-O-tom-protected phosphoramidite building blocks were obtained in pure form and were successfully employed for the routine synthesis of oligoribonucleotides on DNA synthesizers. Under DNA coupling conditions (2.5 min coupling
Synthesis and Properties of 2?-Deoxy-1?,2?-seco-D-ribosyl (5? ? 3?)oligonucleotides (= 1?,2?-seco-DNA) containing adenine and thymine
作者:Ling Peng、Hans-Jorg Roth
DOI:10.1002/hlca.19970800513
日期:1997.8.11
Some 2′-deoxy-1′,2′-seco-D-ribosyl (5′3′)oligonucleotides (= 1′,2′-seco-DNA), differing from natural DNA only by a bond scission between the centers C(1′) and C(2′), were synthesized and studied in order to compare their structure properties and pairing behavior with those of corresponding natural DNA and homo-DNA oligonucleotides (2′,3′-dideoxy-β-D-glucopyranosyl oligonucleotides). Starting from (−)-D-tartaric
We report the synthesis of a modified 8mer RNA sequence, (C-C-C-C-A-C-C-(2′-thio)A)-RNA 5′-(dihydrogen phosphate) (9) containing a 3′-terminal 2′-thioadenosine (Schemes 2 and 3), and its spontaneous and site-specific aminoacylation with the weakly activated amino acid thioester HPheSPh (12). This reaction, designed in analogy to the ‘native chemical ligation’ of oligopeptides, occurs efficiently in
An Efficient Synthesis of Enantiomeric Ribonucleic Acids fromD-Glucose
作者:Stefan Pitsch
DOI:10.1002/hlca.19970800803
日期:1997.12.15
automated synthesis from appropriate building blocks, carrying a known photo-labile 2′-O-protecting group. A simple large-scale synthesis of the new, prefunctionalized L-ribose derivative 5 from D-glucose (Scheme 1) and its straightforward conversion into the five phosphoramidites 28–32 and five solid supports 38–42, respectively, were elaborated (Scheme 4). Within this project, a novel, superior strategy
The prepn. and the pairingproperties of the new 3'-deoxyribopyranose (4'->2')-oligonucleotide (= p-DNA) pairingsystem, based on 3'-deoxy-b-D-ribo-pyranose nucleosides is presented. D-Xylose was efficiently converted to the prefunctionalized 3-deoxyribopyranose deriv. 4-O-[(tert-butyl)dimethylsilyl]-3-deoxy-D-ribo-pyranose 1,2-diacetate (obtained as a 4:1 mixt. of a- and b-D-anomers). From this sugar