Studies on annulated 1,4-benzothiazines and 1,5-benzothiazepines. IX. Imidazo [2,1-d][1,5] benzothiazepines: synthesis and in vitro benzodiazepine receptor affinity
摘要:
The synthesis of three series of 1- and 2-substituted imidazo[2,1-d][1,5]benzothiazepines is accomplished starting from 1,5-benzothiazepin-4-ones. All the synthesized compounds were evaluated for their affinity for the benzodiazepine receptor, testing their ability to displace [H-3]Flunitrazepam from bovine brain membrane protein. A few of the tested compounds showed good affinity, in particular compound 9a (K-i = 43.00 nM). The GABA-ratio of the active compounds suggests an antagonist or partial agonist activity. The data obtained allow us to draw some comments on the structure-activity relationships.
已经研究了在各种反应条件下不同取代的1,4-硫氮杂的重排。2-苯基-4-甲硫基-苯并[ b ] -1,4-噻氮平(3)和2-苯基-苯并[ b ] -1,4-硫氮杂-4(5H)-硫酮(2)在60℃下挤出硫。碱的催化作用,并分别重排为2-甲硫基-4-苯基-喹啉(4)和4-苯基-硫代咔唑(6)。在相同条件下,2-苯基-4-甲硫基-2,3-二氢-苯并[ b ] -1,4-噻氮平(11)重排为2-苯乙烯基-苯并噻嗪(12),而二氧化物18显示没有重新排列的趋势。通过用多磷酸处理,可以将2,7-二苯基-六氢-1,4-硫氮杂-5-酮(19)转化为2-苯乙烯基-5-苯基-2-噻唑啉(20)。讨论了这些重排的可能机制。