Synthesis and biological evaluation of sulfonamidooxazoles and β-keto sulfones: selective inhibitors of 11β-hydroxysteroid dehydrogenase type I
摘要:
The design, synthesis, and biological evaluation of arylsulfonamidooxazoles as 11 beta-HSD1 inhibitors and the serendipitous discovery of beta-keto sulfones as potent 11 beta-HSD1 inhibitors are described here. These two classes of compounds are not active against 11 beta-HSD2 and therefore may have significant therapeutic potential for metabolic syndrome, type 2 diabetes and related metabolic dysfunctions. (c) 2005 Elsevier Ltd. All rights reserved.
Kutznerides 1−4, Depsipeptides from the Actinomycete Kutzneria sp. 744 Inhabiting Mycorrhizal Roots of Picea abies Seedlings
摘要:
Bioassay-guided fractionation of culture supernatants of the actinomycete Kutzneria sp. 744 resulted in the isolation of four new depsipeptides (1-4). Structure analysis revealed the general structure: cyclo[2-(I-methylcyclopropyl)-D-glycine-(2S,3aR,8aS)-6,7-dichloro-3a-hydroxy-1,2,3,3a,8,8a-hexahydropyrrolo[2,3-b]indole-2-carboxylic acid-3-hydroxy-D-glutamic acid-o-methyl-L-serine-L-piperazie acid-(S)-2-hydroxy-3,3-dimethylbutanoic acid]. The 3-hydroxy-D-glutamic acid was present as its threo-isomer in 1 and 2 and as its erythro-isomer in 3 and 4. The piperazic acid was modified to its (R)-4-chloro analogue in 2 and to its C-5/N unsaturated analogue in 4. Compounds 1-4 displayed moderate spore germination inhibiting activity against several common root-rotting fungi.
Highly mild approach towards synthesis of tetrasubstituted thiophenes by an organic salt afforded by cyclic thioureas and ketene dithioacetals
作者:Abdolali Alizadeh、Amir Hossein Vahabi、Ayoob Bazgir、Hamid Reza Khavasi、Zhe Zhu、Seik Weng Ng
DOI:10.1039/c5ra15544d
日期:——
An organic salt generated by cyclic thioureas and 2-di(methylsulfanyl)methylenemalononitrile in reaction with primary and secondary α-haloketones leads to tetrasubstituted thiophenes without using additional base or catalyst at room temperature.