Access to 4-substituted 3,4-dihydroquinolin-2(1H)-ones by an unusual radical cyclisation of a secondary amide
摘要:
A novel route to 3,4-dihydroquinolin-2(1H)-ones involving two radical addition steps is reported, starting from readily accessible xanthates and N-aryl-3-butenamides. (c) 2005 Elsevier Ltd. All rights reserved.
Useful four-carbon synthons en route to monastrol analogs
作者:Amr M. Abdou、S. Botros、Rasha A. Hassan、Mona M. Kamel、Douglass F. Taber、Azza T. Taher
DOI:10.1016/j.tet.2014.11.022
日期:2015.1
A simple protocol has been established for the preparation of a family of crystalline N-aryl γ-hydroxycrotonamides, useful four-carbon synthons. These were further elaborated to analogs of monastrol having variant ester sidechains, that were evaluated for their anticancer activity employing the NCI 60 cell line panel.
A catalytic base-controlled regiodivergent and chemoselective nucleophilic hydrofunctionalization of both terminal and internal β,γ-unsaturated amides was reported for the first time.
Reaction of organozinc halides with aryl isocyanates
作者:Haoran Yang、Danfeng Huang、Ke-Hu Wang、Changming Xu、Teng Niu、Yulai Hu
DOI:10.1016/j.tet.2013.01.053
日期:2013.3
Reformatsky reagent, benzylzinc bromide or alkylzinc iodides react with arylisocyanates directly to give corresponding N-substituted carbamates under mild reaction conditions. However, the reaction of allylzinc bromide or propargylzinc bromide with arylisocyanates produces the corresponding N-substituted amides. The reactions provide alternative methods for the synthesis of N-substituted carbamates
Copper-Catalyzed Asymmetric Cyanation of Alkenes via Carbonyl-Assisted Coupling of Alkyl-Substituted Carbon-Centered Radicals
作者:Song Zhou、Guoyu Zhang、Liang Fu、Pinhong Chen、Yibiao Li、Guosheng Liu
DOI:10.1021/acs.orglett.0c02085
日期:2020.8.21
the first copper-catalyzed asymmetric cyanation of alkyl-substituted alkenes has been developed. The reaction, featuring mild reaction conditions and excellent functional group compatibilities, provides an easy access to a wide array of structurally diverse enantioenriched alkyl nitriles in good yields. Notably, an unstable carbon-centered radical generated by trifluoromethyl radical addition across terminal
a C=C double bond is present in the molecule, an intramolecular cyclization process takes place in an exo mode with additional generation of a hydroxy group at the terminal position of the original olefin moiety to render a series of pyrrolidine and piperidine derivatives. In this paper, proofs are offered to conclude that, according to our assumption, an ionic mechanism rather than a radical one must