Compounds of the following general formula (1) and salts thereof: 1
where A represents an alkylene group having 1 to 2 carbon atoms, etc.; B
represents an aromatic heterocyclic group which may have a substituent,
etc.; R.sub.1 and R.sub.2 each represent a hydrogen atom, a protective
group for a hydroxyl group for synthesis of nucleic acid, a phosphate
group, or --P(R.sub.4)R.sub.5 [where R.sub.4 and R.sub.5 are the same or
different, and each represent a hydroxyl group, a hydroxyl group
protected with a protective group for synthesis of nucleic acid, a
mercapto group, a mercapto group protected with a protective group for
synthesis of nucleic acid, etc.]; and R.sub.3 represents a hydrogen atom,
a halogen atom, a hydroxyl group, a hydroxyl group protected with a
protective group for synthesis of nucleic acid, etc.
These compounds are useful for producing oligonucleotide analogues useful
for the antisense method, antigene method, etc., and for producing their
intermediates.
