An asymmetric pericyclic cascade approach to 3-alkyl-3-aryloxindoles: generality, applications and mechanistic investigations
作者:Edward Richmond、Kenneth B. Ling、Nicolas Duguet、Lois B. Manton、Nihan Çelebi-Ölçüm、Yu-Hong Lam、Sezen Alsancak、Alexandra M. Z. Slawin、K. N. Houk、Andrew D. Smith
DOI:10.1039/c4ob02526a
日期:——
The reaction of l-serine derived N-arylnitrones with alkylarylketenes generates 3-alkyl-3-aryloxindoles in good yields and excellent enantioselectivities.
Catalytic Asymmetric Synthesis of Esters from Ketenes
作者:Sheryl L. Wiskur、Gregory C. Fu
DOI:10.1021/ja0506152
日期:2005.5.1
By building on elementary principles of Brønsted acid-base chemistry, a nucleophile-catalyzed method for the asymmetric synthesis of esters fromketenes has been transformed into a much more versatile and effective Brønsted acid-catalyzed process. The product aryl esters can be converted into useful derivatives, such as enantioenriched alcohols and carboxylic acids.
Pseudo-C2-symmetric chiral phosphorus ylide is designed and synthesized for the enantioselective preparation of allenic esters, amides, ketone, and nitrile. Up to 92% ee is achieved.
设计并合成了伪C 2对称的手性磷叶立德,用于对映体制备烯丙酸酯,酰胺,酮和腈。达到了92%ee。
Chiral spiro phosphoric acid-catalysed enantioselective reaction of ketenes with N–H pyrroles
作者:Qian-Yi Wang、Teng-Fei Liu、Li-Feng Chu、Yun Yao、Chong-Dao Lu
DOI:10.1039/d1cc05307h
日期:——
In the presence of a chiral spiro phosphoric acid catalyst, the asymmetric reaction of disubstituted ketenes with N–H pyrroles occurred to afford enantioenriched C-acylated pyrroles bearing α-stereogenic carbon centres. The described reaction constitutes a rare example of a catalytic asymmetric reaction of ketenes with carbon-based nucleophiles.
Mild Acylation of C(sp<sup>3</sup>)–H and C(sp<sup>2</sup>)–H Bonds under Redox-Neutral Rh(III) Catalysis
作者:Songjie Yu、Yingzi Li、Lingheng Kong、Xukai Zhou、Guodong Tang、Yu Lan、Xingwei Li
DOI:10.1021/acscatal.6b02668
日期:2016.11.4
molecules. Although C–H bond acylation has been well-studied via different mechanisms, transition-metal-catalyzed redox-neutral C(sp3)–H acylation under mild conditions is unprecedented. In this work, ketene is designed as a acylating reagent for both C(sp3)–H and C(sp2)–Hbonds under Rh(III) catalysis, affording a diverse array of carbonyl compounds in high yields and high atom economy under mild conditions