| abstract |
A HETEROCYCLIC COMPOUND REPRESENTED BY THE GENERAL FORMULA (1) OR A SALT THEREOF: WHEREIN M, 1, AND N RESPECTIVELY REPRESENT AN INTEGER OF 1 OR 2; X REPRESENTS -O- OR -CH2-; R1 REPRESENTS HYDROGEN, A LOWER ALKYL GROUP, A HYDROXY-LOWER ALKYL GROUP, A PROTECTING GROUP, OR A TRI-LOWER ALKYLSILYLOXY-LOWER ALKYL GROUP; R2 AND R3, WHICH ARE THE SAME OR DIFFERENT, EACH INDEPENDENTLY REPRESENT HYDROGEN OR A LOWER ALKYL GROUP; OR R2 AND R3 ARE BONDED TO FORM A CYCLO-C3-C8 ALKYL GROUP; AND R4 REPRESENTS AN AROMATIC GROUP OR A HETEROCYCLIC GROUP, WHEREIN THE AROMATIC OR HETEROCYCLIC GROUP MAY HAVE ONE OR MORE ARBITRARY SUBSTITUENT(S). |