PROCESS FOR THE SYNTHESIS OF OLIGONUCLEOTIDES
First Claim
1. A method for the solid phase synthesis of oligonucleotides, wherein each synthesis cycle of the method comprises:
- (a) cleaving a front end protective group from a nucleoside immobilized on a solid support to liberate a hydroxyl group on the nucleoside, the front end protective group comprising an acyl group, the cleaving reagent comprising an organic base selected from the group consisting of a primary amine, a secondary amine, and a mixture thereof; and
(b) coupling an acyl protected nucleoside phosphoramidite with the hydroxyl group of the nucleoside immobilized on the solid support.
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Abstract
The present invention discloses novel methods for the synthesis of oligonucleotides with nucleoside phosphoramidites on solid supports. The methods comprise the stepwise chain assembly of oligonucleotides on supports with 5′-acyl phosphoramidites. The synthesis cycles consist of a front end deprotection step which is conducted with a solution of a primary amine or a phenolate, a phosphoramidite coupling step with a 5′-acyl nucleoside phosphoramidite in the presence of an activator, a phosphite oxidation step and an optional capping step. The novel methods improve the quality of synthetic oligonucleotides due to the irreversibility of the front end deprotection step, which prevents the formation of deletion sequences, and due to the avoidance of acidic reagents in the synthesis cycles, which prevent the formation of depurination side products. The invention further discloses novel nucleoside phosphoramidite compositions wherein the phosphoramidites carry acyl front end protective groups which are cleavable with primary amines or phenolates. The invention is applicable to the synthesis of oligodeoxyribonucleotides, oligoribonucleotides and oligonucleotides with modifications in their sugar or phosphate groups.
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Citations
24 Claims
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1. A method for the solid phase synthesis of oligonucleotides, wherein each synthesis cycle of the method comprises:
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(a) cleaving a front end protective group from a nucleoside immobilized on a solid support to liberate a hydroxyl group on the nucleoside, the front end protective group comprising an acyl group, the cleaving reagent comprising an organic base selected from the group consisting of a primary amine, a secondary amine, and a mixture thereof; and
(b) coupling an acyl protected nucleoside phosphoramidite with the hydroxyl group of the nucleoside immobilized on the solid support. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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- 16. A nucleoside phosphoramidite comprising an acyl front end protective group and a phosphoramidite group, wherein the acyl front end protective group is cleavable with an organic base selected from the group consisting of a primary amine, a secondary amine, and a mixture thereof in 10 minutes or less at room temperature.
Specification