Stereospecific Synthesis of P-Chiral Analogs of Oligonucleotides
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Last Update: 2020-10-30
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Source: Internet
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Author: User
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As has been emphasized in corresponding chapters of this book, isotopic or elemental replacement of any of two nonbridging oxygens attached to internucleotide phosphorus atom(s) by substituent X (Fig. 1 ) creates, by virtue of asymmetry, new center(s) of chirality and results in the formation of
m
diastereoisomers of the oligonucleotide’s congener. The number m is determined by the number
n
of modified phosphates, according to formula
m
= 2
n
. With the exception of diastereoisotopomers (X=
17
O or
18
O), which are nonseparable by any so-far-developed separation technique, separation of diastereoisomeric oligonucleotides containing modified phosphates (Fig. 1 , X = S; Se; C
2
H
5
O-; CH
3
-; ArNH-; R
2
N-) has been achieved by means of chromatographic techniques. Effectiveness of the separation depends, however, on the number of modifications within the oligonucleotide chain and is practically limited to
n
=l,2. Achievements in this field have been exhaustively summarized by Zon (
1
).Fig. 1.
Modifications to the
DNA
phosphate groups.
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