Patent ID: 6914148

Claim:
A monomer of the formula: wherein: Y 1 is a hydroxyl protecting group; Y 2 is a phosphoramidite, H-phosphonate, phosphate triester, or a linking moiety attached to a solid support; each R 2 , R 3 , R 3′ , and R 4 is, independently, hydrogen, C(O)R 5 , substituted or unsubstituted C 1 -C 10 alkyl, substituted or unsubstituted C 2 -C 10 alkenyl, substituted or unsubstituted C 2 -C 10 alkynyl, alkylsulfonyl, or arylsulfonyl, wherein the substituent groups are selected from hydroxyl, amino, alkoxy, carboxy, benzyl, phenyl, nitro, thiol, thioalkoxy, halogen, alkyl, aryl, alkenyl and alkynyl; or R 3 and R 4 , together, are R 7 ; each R 5 is, independently, substituted or unsubstituted C 1 -C 10 alkyl, trifluoromethyl, cyanoethyloxy, methoxy, ethoxy, t-butoxy, allyloxy, 9-fluorenylmethoxy, 2-(trimethylsilyl)-ethoxy, 2,2,2-trichloroethoxy, benzyloxy, butyryl; iso-butyryl, phenyl or aryl; R 7 is hydrogen or forms a phthalimide moiety with the nitrogen atom to which it is attached; and n is an integer from 1 to about 6.