Synthesis of 2-dimethylaminoimidazole derivatives: a new access to indolyl-imidazole alkaloids of marine origin.
摘要:
The first preparation of 2-dimethylaminoimidazole 1a, a structural feature of several marine products was undertaken and its reactivity investigated. The synthesis of natural alkaloids 5 and 12b was achieved by direct coupling of the easily accessible oxidized 2-dimethylaminoimidazoles 7 and 8 with indole-3-carboxaldehyde and indole respectively, demonstrating the usefulness of this approach for other structurally related natural products.
Novel Aplysinopsin-Type Alkaloids from Scleractinian Corals of the Family Dendrophylliidae of the Mediterranean and the Philippines. Configurational-assignment criteria, stereospecific synthesis, and photoisomerization
scleractinian coral Tubastraea sp. (Dendrophylliidae) collected at Palawan, Philippines, 3′-deimino-3′-oxoaplysinopsin (4) and 6-bromo-3′-deimino-3′-oxoaplysinopsin (6) are now isolated as 5:2 mixtures of (E/Z) stereoisomers. The 3′-deimino-2′,4′-bis(demethyl)-3′-oxoaplysinopsin (7) and 6-bromo-3′-demino-2′,4-bis(demethyl)-3′-oxoaplysinopsin (5) are isolated as 2:3 and 1:1 (E/Z) mixtures, respectively
5-(Indol-3-ylmethylene)-1,3-dimethyl-2-methylimino-4-imidazolidinone and its geometric isomers, prepared, inter alia, from indole-3-aldehyde and 1,3-dimethyl-2-methylimino-4-imidazolidinone, are described. The end products are useful as antidepressants.
Gulati, Deepa; Chauhan, P. M. S.; Pratap, Ram, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1994, vol. 33, # 1, p. 4 - 9
作者:Gulati, Deepa、Chauhan, P. M. S.、Pratap, Ram、Bhakuni, D. S.
DOI:——
日期:——
Synthesis and evaluation of aplysinopsin analogs as inhibitors of human monoamine oxidase A and B
作者:Kevin Lewellyn、Dobroslawa Bialonska、Narayan D. Chaurasiya、Babu L. Tekwani、Jordan K. Zjawiony
DOI:10.1016/j.bmcl.2012.06.058
日期:2012.8
Aplysinopsins are tryptophan-derived natural products that have been isolated from a variety of marine organisms. Previous studies have shown aplysinopsin analogs to possess a variety of biological activities, including modulation of neurotransmissions. A series of fifty aplysinopsin analogs was synthesized and assayed for monoamine oxidase A and B inhibitory activity. Three compounds displayed significant MAO inhibitory activity and selectivity. The compound (E)-5-[(6-bromo-1H-indol-3-yl) methylene]-2-imino-1,3-dimethylimidazolidin-4-one (3x) possessed an IC50 of 5.6 nM at MAO-A and had a selectivity index of 80.24. An SAR study revealed that multiple N-methylations, one of which should be at position N-2', and bromination at C-5 or C-6 are important factors for MAO-A potency and selectivity. (c) 2012 Elsevier Ltd. All rights reserved.
In vitro structure–activity relationships of aplysinopsin analogs and their in vivo evaluation in the chick anxiety–depression model
作者:Kevin Lewellyn、Dobroslawa Bialonska、Melissa J. Loria、Stephen W. White、Kenneth J. Sufka、Jordan K. Zjawiony
DOI:10.1016/j.bmc.2013.09.011
日期:2013.11
Aplysinopsins are tryptophan-derived natural products that have been isolated from a variety of marine organisms and have been shown to possess a range of biological activities. In vitro receptor binding assays showed that of the 12 serotonin receptor subtypes, analogues showed a high affinity for the 5-HT2B and 5-HT2C receptor subtypes, with selectivity for 5-HT2B over 5-HT2C. While no conclusions could be drawn about the number and position of N-methylations, bromination at C-4 and C-5 of the indole ring resulted in greater binding affinities, with K-i's as low as 35 nM. This data, combined with previous knowledge of the CNS activity of aplysinopsin analogs, suggested that these compounds may have potential as leads for antidepressant drugs. Compounds 3c, 3u, and 3x were evaluated in the chick anxiety-depression model to assess their in vivo efficacy. Compound 3c showed a modest antidepressant effect at a dose of 30 nM/kg in the animal model. (C) 2013 Elsevier Ltd. All rights reserved.