Iridium-Catalyzed Cyclization of Isoxazolines and Alkenes: Divergent Access to Pyrrolidines, Pyrroles, and Carbazoles
作者:Zu-Feng Xiao、Ting-Hui Ding、Sheng-Wei Mao、Zaher Shah、Xiao-Shan Ning、Yan-Biao Kang
DOI:10.1021/acs.orglett.6b02905
日期:2016.11.4
iridium-complex-catalyzed N–O-cleaving rearrangement/cyclization of 2,3-dihydroisoxazoles with alkenes has been developed. It provides divergent access to multiple substituted pyrrolidines, pyrroles, and carbazoles. The iridium catalyst remains highlycatalytic active after seven cycles. The gram-scale synthesis afforded a carbazole with strong bluish-violet fluorescence.
Unexpected cyclization of <i>ortho</i>-nitrochalcones into 2-alkylideneindolin-3-ones
作者:Nicolai A. Aksenov、Dmitrii A. Aksenov、Nikolai A. Arutiunov、Daria S. Aksenova、Alexander V. Aksenov、Michael Rubin
DOI:10.1039/d0ra03520c
日期:——
An original, facile, and highly efficient method for the preparation of 2-(3-oxoindolin-2-ylidene)acetonitriles from ortho-nitrochalcones is described. The featured transformation is a triggered Michael addition of the cyanide anion to the chalcone followed by a cascade cyclization mechanistically related to the Baeyer–Drewson reaction.
Synthesis of 2-carboxyaniline-substituted maleimides from 2′-nitrochalcones
作者:Nicolai A. Aksenov、Dmitrii A. Aksenov、Daniil D. Ganusenko、Igor A. Kurenkov、Alexander V. Leontiev、Alexander V. Aksenov
DOI:10.1039/d3ob00197k
日期:——
A practical, one-pot approach to 3-anilino-4-(het)arylmaleimides by simple heating of aqueous DMSO solution of 2′-nitrochalcones with potassiumcyanide in the presence of formic acid has been developed. This new reaction provides effective access to a variety of β-substituted α-aminomaleimides which have recently become a subject of growing interest as small, easily modified and environmentally responsive
Synthesis and Binding Activity of Some Pyrazolo[1,5-<i>c</i>]quinazolines as Tools To Verify an Optional Binding Site of a Benzodiazepine Receptor Ligand
The synthesis and binding activity at the benzodiazepinereceptor of some 2-substituted pyrazolo[1,5-c]quinazolines are reported. The structure-activity relationships and in vitro efficacy of the title compounds, which are devoid of the proton acceptor atom at position 1, are similar to those of some previously reported tricyclic heteroaromatic compounds. This suggests that a proton acceptor at position