A Short Synthesis of 2,3,5-Trisubstituted Pyrroles by an Alkylation/Dehydrocyanation Sequence
摘要:
2,3,5-Trisubstituted pyrroles were prepared in a one-pot procedure from readily available 3,5-disubstituted 3,4-dihydro-2H-pyrrole-2-carbonitriles by an alkylation/dehydrocyanation sequence. The method was also applied to a,co-dihaloalkanes to furnish dipyrroles tethered with an alkyl spacer.
A simple organocatalytic Michael-aldol-dehydration domino approach to chiral 3,5-diaryl-cyclohexenones from acetone and α,β-unsaturated ketones was developed for the first time using a simple chiral primary amine as a catalyst. Moderate to good yields (up to 85%) and excellent enantioselectivities (88–98% ee) were obtained.
The catalytic asymmetric aza-Michaelreaction of benzoyl hydrazine toward chalcones through the nonactivated amine moiety conjugated addition was facilitated by the developed N,N'-dioxide-Sc(OTf)(3) complex under mild conditions, affording the pharmacologically and synthetically useful products in moderate to high yields with up to 97% ee.
Synthesis of new 2-(5-substituted-3-phenyl-2-pyrazolinyl)-1,3-thiazolino[5,4-b]quinoxaline derivatives and evaluation of their antiamoebic activity
作者:Asha Budakoti、Abdul Roouf Bhat、Amir Azam
DOI:10.1016/j.ejmech.2008.02.002
日期:2009.3
linyl))methane-1-thione derivatives (1a–8a) and 2-(5-substituted-3-phenyl-2-pyrazolinyl)-1,3-thiazolino[5,4-b]quinoxaline derivatives (1b–8b) and evaluated for their in vitro antiamoebic activity against HM1:IMSS strain of E. histolytica. All the compounds were characterized by electronic, IR, 1H NMR and mass spectroscopic data. It was observed that the antiamoebic activity enhances on modifying the
在努力开发有效的antiamoebic剂,我们已经合成的查耳酮(1 - 8),2-氨基-5-取代的- (3-苯基(2-吡唑啉基))甲烷-1-硫酮衍生物(1A - 8A)和2-( 5-取代的-3-苯基-2-吡唑啉基)-1,3-噻唑啉代[5,4- b ]喹喔啉衍生物(1b – 8b)并评估了它们对溶血性大肠杆菌HM1:IMSS菌株的体外抗氧活性。所有化合物的特征在于电子,IR,11 H NMR和质谱数据。观察到,通过改变查耳酮对吡唑啉和进而对喹喔啉的结构,抗厌氧活性增强。在人肾上皮细胞系上进行MTT测定以检查化合物的细胞毒性,并将结果与甲硝唑进行比较。与甲硝唑相比,化合物6b具有更好的抗氧活性和更低的毒性。
Graphene oxide nanosheets: a highly efficient and reusable carbocatalyst catalyzes the Michael-cyclization reactions of 4-hydroxycoumarins, 4-hydroxypyrone and 4-hydroxy-1-methylquinolinone with chalcone derivatives in aqueous media
作者:Nazia Kausar、Partha Pratim Ghosh、Gargi Pal、Asish R. Das
DOI:10.1039/c5ra08776g
日期:——
efficient, reusable and cost-effective carbocatalyst for the facilesynthesis of highly diversified 4H-pyransvia a one-pot, two-component condensation reaction between freshly prepared chalcones and 4-hydroxycoumarin in aqueous media offering excellent yields. The new, green and metal free synthetic method also enables the condensation reaction for the formation of a library of pyranoquinolines and
A rational approach for the design and synthesis of 1-acetyl-3,5-diaryl-4,5-dihydro(1H)pyrazoles as a new class of potential non-purine xanthine oxidase inhibitors
作者:Kunal Nepali、Gurinderdeep Singh、Anil Turan、Amit Agarwal、Sameer Sapra、Raj Kumar、Uttam C. Banerjee、Prabhakar K. Verma、Naresh K. Satti、Manish K. Gupta、Om P. Suri、K.L. Dhar
DOI:10.1016/j.bmc.2011.01.058
日期:2011.3
Xanthineoxidase is a complex molybdoflavoprotein that catalyses the hydroxylation of xanthine to uric acid. Fifty three analogues of 1-acetyl-3,5-diaryl-4,5-dihydro(1H)pyrazoles were rationallydesigned and synthesized and evaluated for in vitro xanthineoxidase inhibitory activity for the first time. Some notions about structure activity relationships are presented. Six compounds 41, 42, 44, 46,