Solid phase synthesis of oligonucleotides using carbonate protecting groups and alpha-effect nucleophile deprotection
First Claim
1. A method for synthesizing oligonucleotides which comprises (a) condensing the 3′
- -OH or 5′
-OH group of a support-bound nucleoside or oligonucleotide with a monomeric nucleoside phosphoramidite having a carbonate-protected hydroxyl group, to provide an intermediate in which the support-bound nucleoside or oligonucleotide is bound to the monomeric nucleoside through a phosphite triester linkage, and (b) treating the intermediate provided in step (a) with a deprotecting reagent effective to convert the carbonate-protected hydroxyl group to a free hydroxyl moiety and simultaneously oxidize the phosphite triester linkage to give a phosphotriester linkage.
4 Assignments
0 Petitions
Accused Products
Abstract
The invention provides a method for synthesizing oligonucleotides using carbonate protection of hydroxyl groups and nucleophilic deprotection reagents. The deprotection reagents irreversibly cleave the carbonate protecting groups while simultaneously oxidizing the intemucleotide phosphite triester linkage, and can be used in aqueous solution at neutral to mildly basic pH. The method eliminates the need for separate deprotection and oxidation steps, and, since the use of acid to remove protecting groups is unnecessary, acid-induced depurination is avoided. Fluorescent or other readily detectable carbonate protecting groups can be used, enabling monitoring of individual reaction steps during oligonucleotide synthesis. The invention is particularly useful in the highly parallel, microscale synthesis of oligonucleotides. Reagents and kits for carrying out the aforementioned method are provided as well.
-
Citations
39 Claims
-
1. A method for synthesizing oligonucleotides which comprises (a) condensing the 3′
- -OH or 5′
-OH group of a support-bound nucleoside or oligonucleotide with a monomeric nucleoside phosphoramidite having a carbonate-protected hydroxyl group, to provide an intermediate in which the support-bound nucleoside or oligonucleotide is bound to the monomeric nucleoside through a phosphite triester linkage, and (b) treating the intermediate provided in step (a) with a deprotecting reagent effective to convert the carbonate-protected hydroxyl group to a free hydroxyl moiety and simultaneously oxidize the phosphite triester linkage to give a phosphotriester linkage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 32, 33)
- -OH or 5′
-
30. A method for making an oligonucleotide array made up of array features each presenting a specified oligonucleotide sequence at an address on an array substrate, the method comprising steps of:
-
providing a hydroxyl-derivatized array substrate and treating the array substrate to protect hydroxyl moieties on the derivatized surface from reaction with phosphoramidites, then iteratively carrying out the steps of (i) applying droplets of a nucleophile having a nucleophilic site and a lone electron pair on an atom adjacent to the nucleophilic site to effect deprotection of hydroxyl moieties at selected addresses and simultaneous oxidation of newly formed internucleotide phosphite triester linkage, and (ii) flooding the array substrate with a medium containing a selected monomeric nucleoside phosphoramidite having a carbonate-protected hydroxyl group, to permit covalent attachment of the selected nucleoside to the deprotected hydroxyl moieties at the selected addresses. - View Dependent Claims (31, 34, 35, 36, 37, 38, 39)
in which R4 through R10 are hydrocarbyl optionally substituted with one or more nonhydrocarbyl substituents and optionally containing one or more nonhydrocarbyl linkages. -
39. The method of claim 34, wherein the peroxide is one of t-butyl hydroperoxide, m-chloroperoxybenzoic acid, and mixtures thereof.
-
Specification