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A solution phase synthesis method for preparing an oligonucleotide, wherein at least some of the reagents are solid supported. The method suitable for large-scale synthesis comprises coupling a protected compound with a nucleotide derivative having a protection group in the presence of a solid suppo

A solution phase synthesis method for preparing an oligonucleotide, wherein at least some of the reagents are solid supported. The method suitable for large-scale synthesis comprises coupling a protected compound with a nucleotide derivative having a protection group in the presence of a solid supported activator to give an elongated oligonucleotide with a P(III)-internucleotide bond; optionally processing the elongated oligonucleotide by capping by reaction with a solid supported capping agent and/or by oxidizing or sulfurizing by reaction of the oligonucleotide with a solid supported oxidizing or sulfurization reagent; and removing the protection group. The coupling may include reacting a 3′-protected compound of formula: with a nucleotide derivative having a 5′-protection group, or reacting a 5′-protected compound of formula with a nucleotide derivative having a 3′-protection group.

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1. A method comprising the steps of, in a first cycle, a) providing a first compound having the formula: wherein B is a nucleobase,Y is H or forms a C4′-O2′ methylene linkage with R2,R2 is H, a protected 2′-hydroxyl group, F, a protected amino group, an O-alkyl group, an O-substituted alkyl, a subs

1. A method comprising the steps of, in a first cycle, a) providing a first compound having the formula: wherein B is a nucleobase,Y is H or forms a C4′-O2′ methylene linkage with R2,R2 is H, a protected 2′-hydroxyl group, F, a protected amino group, an O-alkyl group, an O-substituted alkyl, a substituted alkylamino, or forms a C4′-O2′ methylene linkage with Y,R3 is OR′3, NHR″3, NR″3R′″3, a 3′-protected 5′-nucleotidyl group, or a 3′-protected 5′-oligonucleotidyl group,R′3 is a hydroxyl protecting group, andR″3, R′″3 are independently an amine protecting group; b) providing a second compound having the formula: wherein X comprises a P(III) phosphorus atom,Y is H or forms a C4′-O2′ methylene linkage with R2,B is a nucleobase,R2 is H, a protected 2′-hydroxyl group, F, a protected amino group, an O-alkyl group, an O-substituted alkyl, a substituted alkylamino or a C4′-O2′ methylene linkage, andR5 is a hydroxyl protecting group, a 5′-protected 3′-nucleotidyl group, or a 5′-protected 3′-oligonucleotidyl group; c) reacting the first compound with the second compound in the presence of a solid supported activator to produce 3′-5′-protected elongated oligonucleotide comprising an internucleotide linkage comprising a P(III) phosphorus atom;d) optionally modifying the 3′-5′-protected elongated oligonucleotide by either or both of steps d1) and d2) in any sequence: d1) reacting the 3′-5′-protected elongated oligonucleotide with a solid supported capping reagent;d2) reacting the 3′-5′-protected elongated oligonucleotide with a solid supported oxidizing reagent to provide an internucleotide linkage comprising a P(V) phosphorus atom;e) removing the 5′-protection group by reacting the 3′-5′-protected elongated oligonucleotide with (i) a solid supported deprotection reagent or (ii) a deprotection reagent followed by addition of a solid supported scavenger, to produce a 3′-protected elongated oligonucleotide; andf) in a second cycle, repeating steps a) to e) wherein the first compound provided in step a) of the second cycle is the 3′-protected elongated oligonucleotide of step e) of the first cycle. 2. The method of claim 1, wherein the second compound of step b) is a phosphoramidite or a H-phosphonate. 3. The method of claim 1 wherein the solid supported activator of step c) is selected from the group consisting of a solid support bearing a pyridinium salt, a cation exchange solid support with an optionally substituted pyridinium salt, a cation exchange solid support with an optionally substituted imidazolium salt, a solid support bearing an optionally substituted azole selected from the group consisting of imidazole, triazole, and tetrazole, a salt of a weak base anion exchange resin with a strong acid, a weak cation exchange resin (carboxylic) in its protonated form, a solid support bearing an optionally substituted phenol, and wherein the solid supported capping reagent of step d1) is selected from the group consisting of a solid supported carboxylic acid chloride, a solid supported carboxylic acid bromide, a solid supported sulfonic acid chloride, a solid supported sulfonic acid, a solid supported chloroformate, a solid supported bromoformate, a solid supported chlorosulfite, a solid supported bromosulfite, a solid supportedphosphorochloridate, a solid supported phosphorobromidate, and a solid supported carbodiimide. 4. The method of claim 1, wherein the solid supported oxidizing reagent is selected from the group consisting of solid supported periodate, solid supported permanganate, solid supported osmium tetroxide, solid supported dichromate, solid supported hydroperoxide, solid supported substituted alkylamine oxide, solid supported percarboxylic acid, and solid supported persulfonic acid. 5. The method of claim 1, wherein the solid supported oxidizing reagent is a solid supported sulfurization reagent. 6. The method of claim 5, wherein the solid supported sulfurization reagent is selected from the group consisting of a solid supported tetrathionate, a solid supported alkyl or aryl sulfonyl disulfide, a solid supported optionally substituted dibenzoyl tetrasulfide, a solid supported bis(alkyloxythiocarbonyl)tetrasulfide, a solid supported optionally substituted phenylacetyl disulfide, a solid supported N-[(alkyl or aryl)sulfanyl]alkyl or aryl substituted succinimide, and a solid supported (2-pyridinyldithio)alkyl or aryl. 7. The method of claim 1, wherein the solid supported capping reagent is a solid supported activated acid, a solid supported carboxylic acid chloride, a solid supported carboxylic acid bromide, a solid supported azolide, a solid supported substituted azolide, a solid supported anhydride, a solid supported chloroformate, a solid supported phosphorochloridate, a solid supported phosphoramidite, or a solid supported H-phosphonate monoester. 8. The method of claim 1, wherein R5 is a dimethoxytrityl group (DMTr) or a monomethoxytrityl group (MMTr) and the solid supported deprotection reagent of step e) is a cationic ion exchanger resin in the H+ form or solid supported ceric ammonium nitrate. 9. The method of claim 1, wherein R′3 is a silyl group and the solid supported deprotection reagent of step e) is a solid supported ammonium fluoride. 10. The method of claim 1, wherein R′3 is a silyl group and the solid supported deprotection reagent of step e) is a solid supported hydrazine or a solid supported hydrazinium. 11. A method comprising the steps of, in a first cycle, a) providing a first compound having the formula: wherein B is a nucleobase,Y is H or forms a C4′-O2′ methylene linkage with R2,R2 is H, a protected 2′-hydroxyl group, F, a protected amino group, an O-alkyl group, an O-substituted alkyl, a substituted alkylamino, or forms a C4′-O2′ methylene linkage with Y,R3 is OH or NH2,R5 is a hydroxyl protecting group, a 5′-protected 3′-nucleotidyl group, or a 5′-protected 3′-nucleotidyl; b) providing a second compound having the formula: wherein X comprises a P(III) phosphorus atom,Y is H or forms a C4′-O2′ methylene linkage with R2,B is a nucleobase,R2 is H, a protected 2′-hydroxyl group, F, a protected amino group, an O-alkyl group, an O-substituted alkyl, a substituted alkylamino, or forms a C4′-O2′ methylene linkage with Y,R3 is OR′3, NHR″3, NR″3R′″3,R′3 is a hydroxyl protecting group, a 3′-protected 5′-nucleotidyl group, or a 3′-protected 5′-oligonucleotidyl group, andR″3 and R′″3 are independently an amine protecting group; c) reacting the first compound with the second compound in the presence of a solid supported activator to produce a 5′-3′-protected elongated oligonucleotide comprising an internucleotide linkage comprising a P(III) phosphorus atom;d) optionally modifying the 5′-3′-protected elongated oligonucleotide by either or both of steps d1) and d2) in any sequence; d1) reacting the 5′-3′-protected elongated oligonucleotide with a solid supported capping reagent;d2) reacting the 5′-3′-protected elongated oligonucleotide with a solid supported oxidizing reagent to provide an internucleotide linkage comprising a P(V) phosphorus atom;e) removing the 3′-protection group by reacting the 5′-3′-protected elongated oligonucleotide with (i) a solid supported deprotection reagent or (ii) a deprotection reagent followed by addition of a solid supported scavenger, to produce a 5′-protected elongated oligonucleotide; andf) in a second cycle, repeating steps a) to e) at least once wherein the 5′-protected compound provided in step a) of the second cycle is the 5′-protected elongated oligonucleotide of step d). 12. The method of claim 11, wherein the second compound of step b) is a phosphoramidite or a H-phosphonate. 13. The method of claim 11 wherein the solid supported activator of step c) is selected from the group consisting of a solid support bearing a pyridinium salt, a cation exchange solid support with an optionally substituted pyridinium, a cation exchange solid support with an optionally substituted imidazolium salt, a solid support bearing an optionally substituted azole selected from the group consisting of imidazole, triazole, tetrazole, a salt of a weak base anion exchange resin with a strong acid, a weak cation exchange resin (carboxylic) in its protonated form, a solid support bearing an optionally substituted phenol, a solid supported carboxylic acid chloride, a solid supported carboxylic acid bromide, a solid supported sulfonic acid chloride, a solid supported sulfonic acid bromide, a solid supported chloroformate, a solid supported bromoformate, a solid supported chlorosulfite, a solid supported bromosulfite, a solid supported phosphorochloridate, a solid supported phosphorbromidate, and a solid support bound carbodiimide. 14. The method of claim 11, wherein the solid supported oxidizing reagent is selected from the group consisting of solid supported periodates, solid supported permanganates, solid supported osmium tetroxides, solid supported dichromates, solid supported hydroperoxides, solid supported substituted alkylamine oxides, solid supported percarboxylic acid, and solid supported persulfonic acid. 15. The method of claim 11, wherein the solid supported oxidizing reagent is a solid supported sulfurization reagent. 16. The method of claim 15, wherein the solid supported sulfurization reagent is selected from the group consisting of a solid supported tetrathionate, a solid supported alkyl or aryl sulfonyl disulfide, a solid supported optionally substituted dibenzoyl tetrasulfide, a solid supported bis(alkyloxythiocarbonyl)tetrasulfide, a solid supported optionally substituted phenylacetyl disulfide, a solid supported N-[(alkyl or aryl)sulfanyl]alkyl or aryl substituted succinimide and a solid supported (2-pyridinyldithio)alkyl or aryl. 17. The method of claim 11, wherein the solid supported capping agent is a solid supported activated acid, a carboxylic acid chloride, a carboxylic acid bromide, an azolide, a substituted azolide, an anhydride, a chloroformate, a phosphorochloridate, a solid supported phosphoramidite, or a solid supported H-phosphonate monoester. 18. The method of claim 11, wherein R′3 is a silyl group and the solid supported deprotection reagent of step e) is a solid-supported ammonium fluoride, or R′3 is levulinic acid; and the solid supported agent of step e) is a solid supported hydrazine or a solid supported hydrazinium. 19. The method of claim 11, wherein R3 of the first compound of step a) is OH. 20. A method comprising reacting an oligonucleotide comprising an internucleotide linkage comprising a P(III) phosphorus atom with a solid supported oxidizing reagent, wherein the solid supported oxidizing reagent is (i) an anion exchange resin complexed with a tetrathionate having the formula S4O6−2 or (ii) a solid supported cyanoethylthiosulfate having the formula (NC—CH2—CH2—S—SO3−).