A process for producing an amine which is characterized by reacting an imine with a nucleophilic compound (except a trialkylsilyl vinyl ether) in the presence of a phosphoric acid derivative represented by the formula (1):
wherein A
1
represents a spacer; X
1
and X
2
represent each independently a divalent nonmetal atom or a divalent nonmetal atomic group; and Y
1
is oxygen or sulfur. The invention provides a process by which amines (particularly optically active amines) useful as intermediates of medicines, agricultural chemicals, or the like can be produced without special post-treatment in high yield at high optical purity; and phosphoric acid derivatives (particularly optically active phosphoric acid derivatives) useful in the production of the amines.
2′-5′,3′-5′ Linked triadenylates have been synthesized by direct bisadenylylation of adenosine 2′ and 3′ hydroxyls with an adenosine 5′-phosphorochloridite followed by oxidation.
Pentopyranosyl oligonucleotide systems. Part 11: systems with shortened backbones: (?)-β-ribopyranosyl-(4′→3′)- and (?)-α-lyxopyranosyl-(4′→3′)-oligonucleotides
作者:H Wippo
DOI:10.1016/s0968-0896(01)00220-6
日期:2001.9
>3')-oligonucleotide system-a member of a pentopyranosyloligonucleotide family containing a shortened backbone-is capable of cooperative base-pairing and of cross-pairing with DNA and RNA. In contrast, corresponding (D)-beta-ribopyransoyl-(4'-->3')-oligonucleotides do not show base-pairing under similar conditions. We conclude that oligonucleotidesystems can violate the 'six-bonds-per-backbone-unit'
Pyranosyl-RNA (‘p-RNA’ ) is an oligonucleotidesystem isomeric to natural RNA and composed of the very same building blocks as RNA. Its generational, chemical, and informational properties are deemed to be those of an alternative nucleic acid system that could have been a candidate in Nature's evolutionary choice of the molecular basis of genetic function. We consider the study of the chemistry of
Inverse Phosphotriester DNA Synthesis Using Photochemically-Removable Dimethoxybenzoin Phosphate Protecting Groups
作者:Michael C. Pirrung、Lara Fallon、David C. Lever、Steven W. Shuey
DOI:10.1021/jo951593c
日期:1996.1.1
A method has been developed to prepare short DNA sequences using light to deprotect a nucleoside 3'-phosphotriester, generating a phosphodiester useful for coupling with a free 5'-OH-nucleotide. The dimethoxybenzoin group is used as the photochemically-removable protecting group for the 3'-phosphate. Cyanoethyl is most effective as the second protecting group on the phosphodiester. Because the method is directed at the preparation and use of the DNA sequences while still bound to the support, allyl and allyloxycarbonyl protecting groups are used for the nitrogenous bases since, based on the work of Hayakawa and Noyori, they can be removed without cleaving the DNA from the support. Two simple trinucleotides have been prepared in solution using this method. It has been demonstrated that the photochemical deprotection conditions do not lead to the formation of cyclobutane dimers from adjacent T residues.