Enhanced triple-helix and double-helix formation with oligomers containing modified pyrimidines

摘要

An oligomer comprising at least two nucleomonomers and pharmaceutically acceptable salts thereof wherein at least one of said nucleomonomers comprises a base of formula (1) or (2): wherein each X is independently O or S; R<2> is a group comprising at least one pi bond connected to the carbon atom attached to the base; Pr is (H)2 or a protecting group; with the proviso that when at least one of said nucleomonomers of said oligomer comprises deoxyuridine 5-substituted by vinyl, 1-butenyl, 1-pentenyl, 1-hexenyl, 1-heptenyl, 1-octenyl, 1-propynyl, 1-butynyl, 1-hexynyl, 1-heptynyl, or 1-octynyl, then the remainder of the nucleomonomers comprising said oligomer are not solely comprised of phosphodiester linked 2'-deoxyadenosine, 2'deoxyguanosine, 2'-deoxycytidine, thymidine or a combination thereof; and wherein said oligomer includes at least one unit having one of thirteen specific formulas.