Method for preparing 3'-nitrogen containing polynucleotides

Details Method for preparing 3'-nitrogen containing polynucleotides Method for preparing 3'-nitrogen containing polynucleotides

1995-12-21

1997-04-29

Kunz, Gary L.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carbohydrates or derivatives

536 253, 536 2532, 536 2533, C07H 100, C07H 2100

Patent

active

056250525

ABSTRACT:
A method for synthesizing a polynucleotide having a nitrogen atom at the 3'-end is disclosed. The methods include the following steps. A solid support reagent is provided having the structure shown below: ##STR1## where T is an acid-cleavable hydroxyl protecting group, e.g., 4,4'-dimethoxytritil; Q is a linker connecting the nitrogen and oxygen, e.g., n-hexyl; R.sub.1 is a nitrogen substituent, e.g., hydrogen; R.sub.2 through R.sub.4 are separately hydrogen or lower alkyl; Y is an atom which is electronegative with respect to carbon, e.g., oxygen or sulfur; X.sub.1 is an atom which is electronegative with respect to carbon, e.g., sulfone; Z is a bond or spacer arm, e.g., ethylsuccinate; and W is a derivatized solid synthesis support capable of linking to Z, e.g., an amino-dirivitized controlled pore glass. The solid support is treated with acid to remove the acid-cleavable hydroxyl protecting group. A protected nucleoside monomer and a weak acid is added forming a linkage, and the unreacted sites on the solid support are capped. An oxidizing reagent is added and the above steps are repeated until polynucleotide chain elongation is complete. The polynucleotide is cleaved from the solid support and then deprotected.

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