Phosphine-catalysed (4+1) annulations of β′-acetoxy allenoate with β,γ-unsaturated carbonyl compounds
作者:Yueqi Zhang、Danfeng Wang、Xiaofeng Tong
DOI:10.1039/d1cc00368b
日期:——
While β,γ-unsaturatedcarbonylcompounds have been widely used as γC- or αC-nucleophiles, their potential αC,αC-bisnucleophilic reactivity is still underdeveloped. Herein, a phosphine-catalysed (4+1) annulation of β′-acetoxy allenoate and a β,γ-unsaturatedcarbonylcompound is reported, wherein β′-acetoxy allenoate is the 1,4-biselectrophilic component while the β,γ-unsaturatedcarbonylcompound serves
作者:David E. Olson、Justin Y. Su、D. Allen Roberts、J. Du Bois
DOI:10.1021/ja506532h
日期:2014.10.1
The synthesis of 1,2-diamines has been achieved through a single-step, tandem sequence involving Rh-catalyzed aziridination followed by NaI-promoted rearrangement to an isomeric cyclic sulfamide. Facile ring opening of these products in hot water and pyridine affords differentially protected vicinal diamines. Demonstration of the utility of this method for the syntheses of (±)-enduracididine and (
1,2-二胺的合成是通过单步串联序列实现的,该序列涉及 Rh 催化的氮丙啶化,然后是 NaI 促进的重排为异构环状磺酰胺。这些产物在热水和吡啶中容易开环,得到不同保护的邻二胺。强调了这种方法在 (±)-enduracididine 和 (±)-allo-enduracididine 合成中的效用。
Synthesis of Aromatic Retinoids and Curcuminoids and Evaluation of their Antiproliferative, Antiradical, and Anti-inflammatory Activities
作者:Jacek W. Morzycki、Lucie Rárová、Jiři Grúz、Tomasz Sawczuk、Urszula Kiełczewska、Leszek Siergiejczyk、Agnieszka Wojtkielewicz
DOI:10.1002/open.201600027
日期:2016.8
work, a convenient synthesis of aromatic retinoids and curcuminoids from vinyl or allyl ketones, and the corresponding alcohols, using olefin metathesis as a key reaction, was elaborated. The best yields and diastereoselectivities were obtained from allylic or homoallylic alcohols by employing the two‐step cross‐metathesis/oxidation procedure. The synthesized analogues were tested for their antiproliferative
A range of primary allylic amines were resolved with selectivity factors of up to 491 through [Pd(allyl)Cl]2/(S)-BINAP-catalyzed and mesitylsulfonyl hydrazide-accelerated asymmetricallylicalkylation of malononitriles involving enantioselective C–N bond cleavage under aerobic conditions. Moreover, the reaction proved useful for the asymmetric synthesis of α-branched allyl-substituted malononitriles
A palladium-catalyzed [4+4] cycloaddition of aryl-substituted γ-methylidene-δ-valerolactones (GMDVs) with divinylketones (DVKs) was developed, providing an approach to access various mono-cyclic tetrahydro-2H-oxocines with diverse substituents in 41% to 95% yield with 81:19 to >20:1 dr. This reaction was facilitated by anchoring olefin (C=C), carbonyl (C=O), and arene (Ar) at the α-position of carbonyls