A one-pot sequential bicatalytic asymmetric Michael addition/hydroalkoxylation provides a new series of pyrano-annulated enantioenriched pyrazole derivatives.
Exploring the charge-transfer chemistry of fluorine-containing pyrazolin-5-ones: The complexation of 1-methyl-3-trifluoromethyl-2-pyrazoline-5-one with five π-acceptors
作者:Abdel Majid A. Adam、Tariq A. Altalhi、Hosam A. Saad、Moamen S. Refat、Mohamed S. Hegab
DOI:10.1016/j.molliq.2021.115814
日期:2021.6
Pyrazole derivatives play an important role in medicinal chemistry. In this study, we investigated the charge-transfer (CT) chemistry of one of these derivatives, 1-methyl-3-trifluoromethyl-2-pyrazoline-5-one, referred to as FP. This target compound was interacted with five π-acceptors; picricacid, chloranilic acid, fluoranil, DDQ, and TCNQ in methanol. The elemental and spectral results indicate
Synthesis and antiviral activity of novel pyrazole amides containing α-aminophosphonate moiety
作者:Lintao Wu、Baoan Song、Pinaki S. Bhadury、Song Yang、Deyu Hu、Linhong Jin
DOI:10.1002/jhet.591
日期:2011.3
A series of novel pyrazole amides J1, J2, J3, J4, J5, J6, J7, J8, J9, J10, J11, J12, J13, J14, J15 containing an α‐aminophosphonate moiety were synthesized and subsequently characterized by spectral (IR, 1H‐, 13C‐, 31P‐, and 19F‐NMR) data and elemental analysis. The racemic sample of J1 was further separated into its enantiomers under normal‐phase condition on two immobilized polysaccharide‐based chiral
An efficient one pot asymmetric synthesis of tetrahydropyrano[2,3-c]pyrazoles has been developed. This class of biologically active heterocycles can be obtained via a secondary amine catalyzed asymmetric Michael/Wittig/oxa-Michael reaction sequence. Remarkably, the title compounds were accessible in good to very good yields and very good to excellent enantioselectivities after a single purification
已经开发出有效的一锅不对称合成四氢吡喃并[2,3- c ]吡唑。这类生物活性杂环可通过仲胺催化的不对称迈克尔/维蒂希/氧杂-迈克尔反应序列获得。值得注意的是,在单个纯化步骤之后,标题化合物以良好至非常好的收率和非常良好至优异的对映选择性被获得。