| 摘要 |
<p>Polycyclic alkaloids of formula (I), wherein R1 is H, C1-6 alkyl, or C6-12 aryl optionally substituted with polar groups; R2 abd R3 are independently H, OH, C1-6 alkyl, -C(NH)-NH2, a positively charged group, or C7-13 aralkyl optionally substituted with NH2, OH, C1-6 alkyl, or halogen; or R2 and R3 together form a 5 to 6 member ring optionally incorporating a heteroatom; R4 is H, C1-6 alkyl, OR6, SR6 or N(R6)2, wherein each R6 is independently H, C1-3 alkyl; X is O, S, SO, SO2, N-R5, or C-(R5)2, wherein each R5 is independently H, C1-6 alkyl, or C7-13 aralkyl optionally interrupted with one or more heteroatom; n is an integer from 0 to 2; m is an integer from 0 to 3; with the proviso that when X is CH2 then R1 is not CH3, R2 and R3 are not both H, R4 is not OH, m is not 3 and n is not 0. That act as antagonists at the ionotropic NMDA (N-methyl-(D)-aspartic acid) receptor.</p> |
