2 research outputs found
Labeling Deoxyadenosine for the Preparation of Functional Conjugated Oligonucleotides
Herein we present a versatile synthetic
method for the 8-thioalkylation
of (deoxy)Âadenosine with a short carbon linker having on the other
side a variety of molecules (psoralen, acridine) and functional groups
(alkyne). After conventional protections, the modified adenosine can
be phosphytylated and inserted into an oligonucleotide without affecting
the standard protocols for supported oligonucleotide synthesis. The
hybridization properties of a generic oligonucleotide containing the
above conjugated moieties toward both DNA and RNA are evaluated both
in the case of a perfectly complementary strand and in the case of
a single mismatch. This methodology is suitable for the preparation
of several types of derivatives andî—¸through the alkynyl moietyî—¸provides
fast access to click-chemistry transformations
NO Photoreleaser-Deoxyadenosine and -Bile Acid Derivative Bioconjugates as Novel Potential Photochemotherapeutics
This
contribution reports the synthesis of some novel bioconjugates
with anticancer activity and able to release nitric oxide (NO) under
visible light excitation. The 4-nitro-2-(trifluoromethyl)Âaniline derivative,
a suitable NO photodonor, was conjugated with 2′-deoxyadenosine
and urso- and cheno-deoxycholic acid derivatives, through a thioalkylic
chain or the 4-alkyl-1,2,3-triazole moiety. Photochemical experiments
demonstrated the effective release of NO from 2′-deoxyadenosine
and ursodeoxycholic acid conjugates under the exclusive control of
visible light inputs. Studies for the <i>in vitro</i> antiproliferative
activity against leukemic K562 and colon carcinoma HCT116 cell lines
are reported for all the compounds as well as a case study of photocytotoxicity
against HCT116