Thiophene systems. 12. Analogues of ketanserin and ritanserin as selective 5-HT2 antagonists
作者:JB Press、RK Russell、JJ McNally、RA Rampulla、R Falotico、C Scott、JB Moore、SJ Offord、J Tobia
DOI:10.1016/0223-5234(91)90007-a
日期:1991.11
A series of thieno[3,2-d]-, [3,4-d]- and [2,3-d]pyrimidinedione derivatives was prepared with N-3 substitution containing the side chains of ketanserin and ritanserin. The best of these thiophene analogues were the isosteres of ketanserin which were up to 20-fold more potent than the standards in 5-HT2 binding assays. More importantly, in addition to their increased potency, these derivatives were more selective than the standards in that they had less affinity for 5-HT1A and alpha-1 binding sites. This selectivity is especially noted as the ratio of alpha-1/5-HT2 wherein the most interesting thiophene isostere (2) in this study had a binding selectivity > 12-fold of ketanserin or ritanserin.