Isosteric replacement of the indole nucleus by benzothiophene and benzofuran in a series of indolylglyoxylylamine derivatives with partial agonist activity at the benzodiazepine receptor
摘要:
A number of benzothienyl- and benzofurylglyoxylylamine derivatives, which are analogues of previously described indolylglyoxylylamines with a partial agonist activity, are reported in this paper. They were synthesized and tested to verify the importance of the presence of the indole NH group in the interaction of this class of compounds with the benzodiazepine agonist receptor site, since it was reported in literature that a hydrogen bond donor group such as NH was not necessary to elicit an agonist response. Several thienylglyoxylylamine derivatives were also prepared and tested. None of the compounds showed a high affinity at the BzR, demonstrating that the indole NH plays a decisive role in the interaction of the agonist glyoxylylamine ligands with the receptor site.
Benzofurans as Efficient Dienophiles in Normal Electron Demand [4 + 2] Cycloadditions
作者:Nathalie Chopin、Hélène Gérard、Isabelle Chataigner、Serge R. Piettre
DOI:10.1021/jo802205d
日期:2009.2.6
arising from the reaction have been shown to depend on different factors among which the type of the electron-withdrawing substituent of the benzofuran, the nature of the reacting diene, and the method of activation. In the presence of all-carbon dienes, the reaction yields the expected Diels−Alder adducts. When thermal activation is insufficient, a biactivation associating zinc chloride catalysis and