Journal
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
Volume 2022, Issue 35, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejoc.202200538
Keywords
Hammett correlation; Hydrolysis; Oligonucleotides; Oxazinanes; Protecting groups
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The dependence of the hydrolysis rate of a series of N-methoxy-2-phenyl-1,3-oxazinanes on the Hammett substituent constant of the substituent of the phenyl ring was determined. Based on this information, 4-(benzoyloxy)benzaldehyde was selected as a protecting group for a new (2R,3S)-4-(methoxyamino)butane-1,2,3-triol phosphoramidite building block. The yield of the preparation of this building block as well as its coupling in automated oligonucleotide synthesis were greatly improved compared to the method reported previously.
Dependence of the hydrolysis rate of a series of N-methoxy-2-phenyl-1,3-oxazinanes on the Hammett substituent constant of the substituent of the phenyl ring was determined, yielding a reaction constant rho=-1.40 +/- 0.05. Based on this information, 4-(benzoyloxy)benzaldehyde was selected as a protecting group for a new (2R,3S)-4-(methoxyamino)butane-1,2,3-triol phosphoramidite building block. The yield of the preparation of this building block as well as its coupling in automated oligonucleotide synthesis were greatly improved compared to the method reported previously. The 2-[4-(benzoyloxy)phenyl]-1,3-oxazine protection persisted throughout the synthesis of short oligonucleotides but was rapidly removed when the oligonucleotides were released from solid support and dissolved in water.
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