Process for oligonucleo tide synthesis using phosphormidite intermediates
DCFirst Claim
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1. In a process for producing oligonucleotides which comprises the step of condensing the 3'"'"'-OH or 5'"'"'-OH group of a nucleoside or oligonucleotide with a nucleoside phosphite, the improvement being that the nucleoside phosphite is a compound of one of the formulae:
- ##STR24## wherein B is a nucleoside or deoxynucleoside base;
A is H OH or OR4 in which R4 is a blocking group;
R is a blocking group;
R1 '"'"' is a hydrocarbyl radical containing up to about carbon atoms; and
X is NR2 '"'"'R3 '"'"', wherein R2 '"'"' and R3 '"'"' taken separately each represent alkyl, aryl, aralkyl, cycloalkyl and cycloalkylalkyl containing up to 10 carbon atoms;
R2 '"'"' and R3 '"'"' when taken together form an alkylene chain containing up to 5 carbon atoms in the principal chain and a total of up to 10 carbon atoms with both terminal valence bonds of said chain being attached to the nitrogen atom to which R2 '"'"' and R3 '"'"' are attached; and
R2 '"'"' and R3 '"'"' when taken together with the nitrogen atom to which they are attached form a saturated nitrogen heterocycle including at least one additional heteroatom from the group consisting of nitrogen, oxygen and sulfur.
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Abstract
A new class of nucleoside phosphoramidites which are relatively stable to permit isolation thereof and storage at room temperature. The phosphoramidites are derivatives of saturated secondary amines.
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16 Claims
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1. In a process for producing oligonucleotides which comprises the step of condensing the 3'"'"'-OH or 5'"'"'-OH group of a nucleoside or oligonucleotide with a nucleoside phosphite, the improvement being that the nucleoside phosphite is a compound of one of the formulae:
- ##STR24## wherein B is a nucleoside or deoxynucleoside base;
A is H OH or OR4 in which R4 is a blocking group;
R is a blocking group;
R1 '"'"' is a hydrocarbyl radical containing up to about carbon atoms; and
X is NR2 '"'"'R3 '"'"', wherein R2 '"'"' and R3 '"'"' taken separately each represent alkyl, aryl, aralkyl, cycloalkyl and cycloalkylalkyl containing up to 10 carbon atoms;
R2 '"'"' and R3 '"'"' when taken together form an alkylene chain containing up to 5 carbon atoms in the principal chain and a total of up to 10 carbon atoms with both terminal valence bonds of said chain being attached to the nitrogen atom to which R2 '"'"' and R3 '"'"' are attached; and
R2 '"'"' and R3 '"'"' when taken together with the nitrogen atom to which they are attached form a saturated nitrogen heterocycle including at least one additional heteroatom from the group consisting of nitrogen, oxygen and sulfur. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
- ##STR24## wherein B is a nucleoside or deoxynucleoside base;
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