2-aryl-3-arylazoacrylonitriles are synthesized while attempting the intramolecular N-arylation of 5-aminopyrazoles, using the hypervalent iodine reagent. The synthesis involves phenyl iodine diacetate-assisted ringopening of 5-aminopyrazoles at room temperature. A plausible mechanism for the formation of azoalkenes is proposed.
A copper-catalysed intramolecular N-arylation of 5-aminopyrazoles is demonstrated for the first time. Highly substituted pyrazolo[3,4-b]indoles are synthesized. In particular, the indole core is decorated with halogens and alkyl and methoxy groups. Furthermore, a selectiveN-arylation of unsymmetrical diaryl bromide containing pyrazoles is exemplified, resulting in valuable pyrazolo[1,5-a]benzimidazoles
首次证明了铜催化的5-氨基吡唑的分子内N-芳基化。合成了高度取代的吡唑并[3,4- b ]吲哚。特别地,吲哚核被卤素以及烷基和甲氧基装饰。此外,举例说明了含不对称二芳基溴的吡唑的选择性N-芳基化,得到了有价值的吡唑并[1,5- a ]苯并咪唑。
Synthesis of Vinyl Cyclopropanes via Anion Relay Cyclization
作者:Kevin M. Allegre、Nathan Brennan、Jon A. Tunge
DOI:10.1021/acs.orglett.8b01566
日期:2018.7.20
A method where an allylalcohol is formed from a Tsuji–Trost allylation between a vinyl epoxide and an acyl containing nucleophile is described. Subsequently, a retro-Claisen condensation is utilized as a means of through-space anion relay. The anion relay results in the formation of a reactive carbanion and simultaneously activates an allylic alcohol toward intramolecular Tsuji–Trost cyclopropanation
Rhodium‐Catalyzed Asymmetric Hydrogenation of Tetrasubstituted α,β‐Unsaturated Amides: Efficient Access to Chiral β‐Amino Amides†
作者:Bing Jiao、Fangyuan Wang、Hui Lv
DOI:10.1002/cjoc.202400344
日期:2024.11
The first asymmetrichydrogenation of acyclic tetrasubstituted α,β-unsaturated amides has been achieved by usingRh/DuanPhos complex as a catalyst, delivering chiral β-amino amides with two contiguous chiral centers in excellent yields and high enantioselectivities (up to 99% yield, 96% ee), which provides efficient and concise access to valuable β-amino amide derivatives. The gram-scale reaction and
Human carbonic anhydrase inhibitory profile of mono- and bis-sulfonamides synthesized via a direct sulfochlorination of 3- and 4-(hetero)arylisoxazol-5-amine scaffolds
作者:Mikhail Krasavin、Mikhail Korsakov、Zhanna Zvonaryova、Evgenii Semyonychev、Tiziano Tuccinardi、Stanislav Kalinin、Muhammet Tanç、Claudiu T. Supuran
DOI:10.1016/j.bmc.2017.02.018
日期:2017.3
Three distinct series of isoxazole-based primary mono- and bis-sulfonamides have been synthesized via direct sulfochlorination, each of them delivering nanomolar inhibitors of human carbonic anhydrase. Certain pronounced SAR trends have been established and rationalized by in silico docking. These findings expand the structure-activity knowledge base for heterocycle-containing sulfonamide carbonic anhydrase inhibitors and further validate the power of direct electrophilic sulfochlorination as a means of introducing the pharmacophoric primary sulfonamide group into structurally diverse aromatic precursors. (C) 2017 Elsevier Ltd. All rights reserved.