The Cleavage Reaction of 1,3-Diols. III. The Synthesis of a Pair of Diastereomeric Ditertiary 1,3-Diols and an Effect of Configuration on Mode of Cleavage1
Versatile Methodology to Hydrate Alkynes, in the Presence of a Wide Variety of Functional Groups, with Mercury(II) <i>p</i>-Toluensulfonamidate, Under Catalytic, Mild, and Neutral Conditions
作者:Albert Corominas、Ángel M. Montaña
DOI:10.1080/00397911.2012.686003
日期:2013.8.3
Abstract A method to generate carbonylic compounds from alkynes under mild and neutralconditions, with excellent functional group compatibility and good yields, is described. Hydration takes place under catalytic conditions by using 0.1 to 0.2 equivalents of the easily available and inexpensive mercury(II) p-toluensulfonamidate in a hydroalcoholic solution. After use, the catalyst is rendered inert
Isopropylmagnesium chloride-promoted unilateral addition of Grignard reagents to β-diketones: one-pot syntheses of β-tertiary hydroxyl ketones or 3-substituted cyclic-2-enones
作者:Rui Yuan、Dan Zhao、Li-Yuan Zhang、Xiang Pan、Yan Yang、Pei Wang、Hong-Feng Li、Chao-Shan Da
DOI:10.1039/c5ob02072g
日期:——
unilateral additions of Grignardreagents to acyclic or cyclic β-diketones were effectively promoted by sub-stoichiometric amounts of i-PrMgCl to afford β-tertiary hydroxyl ketones or 3-substituted cyclic-2-enones, respectively. Also, the addition of Grignardreagents to acyclic β-diketones followed by a reaction with cyclic β-diketones in a one-pot process was put forward. The reaction mechanism was discussed
Synthesis of quinolines and naphthyridines via catalytic retro-aldol reaction of β-hydroxyketones with ortho-aminobenzaldehydes or nicotinaldehydes
作者:Song-Lin Zhang、Zhu-Qin Deng
DOI:10.1039/c6ob01452f
日期:——
Cu(I)-catalyzed retro-aldol reaction of β-hydroxyketones with ortho-aminobenzaldehydes and nicotinaldehydes is reported that produces a range of quinolines and naphthyridines with high efficiency and selectivity. This reaction uses β-hydroxyketones as a regiospecific ketone-protected enolate source viacopper-catalyzed retro-aldol Cα–Cβ bond cleavage. The in situ generated copper enolate undergoes kinetically
Copper-catalyzed retro-aldol reaction of β-hydroxy ketones or nitriles with aldehydes: chemo- and stereoselective access to (E)-enones and (E)-acrylonitriles
作者:Song-Lin Zhang、Zhu-Qin Deng
DOI:10.1039/c6ob01198e
日期:——
Under the mild and weakly basic conditions, competitive Cannizzaro-type reaction of benzaldehydes and side reactions of base-sensitive functional groups can be effectively suppressed, which show synthetic advantages of this reaction compared to classic aldol reactions. The synthetic potential of this reaction is further demonstrated by the one-step synthesis of biologically active quinolines and 1,8-naphthyridine
Novel photo-rearrangements of 3,3,5-triaryl-1,2-dioxolanes: evidence for 1,5-dioxyl diradical intermediates
作者:Masaki Kamata、Yasuhiro Nishikata、Mitsuaki Kato
DOI:10.1039/cc9960002407
日期:——
3-(p-Methoxyphenyl)-substituted 1,2-dioxolanes undergo novel photo-rearrangements to afford 1,3-diaryl-3-(p-methoxyphenoxy)propan-1-ones along with 1,3,3-triaryl-3-hydroxypropan-1-ones via 1,5-dioxyl diradical intermediates.