Synthesis of xylo-LNA containing one 2'-O,4'-C-methylene-beta-D-xylofuranos
yl thymine nucleotide monomer and alpha-L-LNAs containing one or four 2'-O,
4'-C-methylene-alpha-L-ribofuranosyl thymine nucleotide monomer(s) has been
accomplished using phosphoramidite chemistry with pyridine hydrochloride a
s activator; oligothymidylate alpha-L-LNA displays strongly enhanced affini
ty towards complementary RNA.