Green Method for the Synthesis of Chromeno[2,3-c]pyrazol-4(1H)-ones through Ionic Liquid Promoted Directed Annulation of 5-(Aryloxy)-1H-pyrazole-4-carbaldehydes in Aqueous Media
摘要:
The first classical heterocyclic ionic liquid (IL) promoted C-H bond oxidant cross-doupling,reaction for the intramolecular annulation of 5-(aryloxy)-1H-pyrazole-4-carbal- dehydes to chromeno[2,37c]pyrazol-4(1H)-ones has been disclosed The promoter 1,3-dibutyl-1H-benzo[d]fl 2 3]- triazol-34-ium bromide can be easily recycled reused with the same efficacies for at least five cycles in aqueous medium The strategy works smoothly and provides applicable protocol to construct a Wide range of products.
Heterocyclic analogs of xanthiones: 5,6-fused 3-methyl-1-phenylpyrano[2,3-<i>c</i>
]pyrazol-4(1<i>H</i>
) thiones-synthesis and NMR (<sup>1</sup>
H, <sup>13</sup>
C, <sup>15</sup>
N) data
作者:Valerie Huemer、Gernot A. Eller、Wolfgang Holzer
DOI:10.1002/mrc.2609
日期:2010.6
Complete and unambiguous assignment of chemical shifts ((1)H, (13)C, (15)N) and couplingconstants ((1)H,(1)H; (13)C,(1)H) was achieved by the combined application of various one- and two-dimensional (1D and 2D) NMR spectroscopic techniques. Unequivocal mapping of most (13)C,(1)H spin couplingconstants is accomplished by 2D (delta, J) long-range INEPT spectra with selective excitation.
Eller, Gernot A.; Haring, Andreas W.; Datterl, Barbara, Heterocycles, 2007, vol. 71, # 1, p. 87 - 104
作者:Eller, Gernot A.、Haring, Andreas W.、Datterl, Barbara、Zwettler, Maryam、Holzer, Wolfgang
DOI:——
日期:——
Heterocyclic analogs of xanthones
作者:A. S. Sarenko、I. Ya. Kvitko、L. S. �fros
DOI:10.1007/bf00487468
日期:1972.6
Synthesis of Some 1-Aryl-4-(2-hydroxybenzoyl)-pyrazol-5-one and 1-Aryl[1]benzopyrano [2,3-<i>c</i>]pyrazol-4(1<i>H</i>)-one Derivatives from 3-Acyl-4-hydroxycoumarins
作者:Bernard Chantegrel、Abdel-Ilah Nadi、Suzanne Gelin
DOI:10.1055/s-1983-30286
日期:——
Heterocyclic analogs of xanthones chromono(3,2-d)pyrazoles