Me<sub>2</sub>Zn-Mediated Addition of Acetylenes to Aldehydes and Ketones
作者:Pier Giorgio Cozzi、Jens Rudolph、Carsten Bolm、Per-Ola Norrby、Claudia Tomasini
DOI:10.1021/jo050115r
日期:2005.7.1
Contrary to expectations, commercially available 2 M Me2Zn in toluene is able to promote the addition of phenylacetylene to aldehydes and ketones. This reactivity is determined by a new, unprecedented mechanism, which involves activation of the zinc reagent via coordination with carbonyl substrates that behave “ligand like”. Broad scope, high tolerance to functional groups, and a simple procedure make
与预期相反,在甲苯中可商购的2 M Me 2 Zn能够促进将苯乙炔添加到醛和酮中。这种反应性是由一种新的,前所未有的机制决定的,该机制涉及通过与表现为“配体样”的羰基底物的配位来激活锌试剂。宽泛的范围,对官能团的高度耐受性以及简单的操作步骤使这种新方法对于合成化学家而言非常有趣。
Transition-Metal-Free, Brønsted Acid-Mediated Cascade Sequence in the Reaction of Propargyl Alcohols with Sulfonamido-indoles/-indolines: Highly Substituted δ- and α-Carbolines
作者:Karuppu Selvaraj、K. C. Kumara Swamy
DOI:10.1021/acs.joc.8b02293
日期:2018.12.21
Brønsted acid-mediated, transition-metal-free reaction of propargyl alcohols with sulfonamido-indoles/-indolines under mild conditions affords highly substituted δ- or α-carbolines in good to excellent yields. This protocol involvescascadereaction sequences of Friedel–Crafts alkylation/ [1,5]-hydrogen shift/electrocyclization/elimination/ [1,2]-aryl migration followed by aromatization. An unexpected
Ru(<scp>ii</scp>)-catalyzed allenylation and sequential annulation of <i>N</i>-tosylbenzamides with propargyl alcohols
作者:Shreemoyee Kumar、Akshay M. Nair、Chandra M. R. Volla
DOI:10.1039/d1cc01768c
日期:——
We hereby report Ru(II)-catalyzed C(sp2)–H allenylation of N-tosylbenzamides to access multi-substituted allenylamides. Furthermore, the allenylamides were converted to the corresponding isoquinolone derivatives via base mediated annulation. The current protocol features low catalyst loading, mild reaction conditions, high functional group compatibility and desired scalability. The unique functionality
我们在此报告了 Ru( II ) 催化的N-甲苯磺酰苯甲酰胺的C(sp 2 )–H 烯丙基化以获得多取代的烯丙基酰胺。此外,通过碱介导的环化将丙二烯基酰胺转化为相应的异喹诺酮衍生物。目前的协议具有催化剂负载低、反应条件温和、官能团兼容性高和所需的可扩展性等特点。所提供的丙二烯的独特功能允许进一步转换以扩展协议的实用性。
Propargylic Activation Across a Heterobimetallic Ir−Sn Catalyst: Nucleophilic Substitution and Indene Formation with Propargylic Alcohols
作者:Paresh Nath Chatterjee、Sujit Roy
DOI:10.1021/jo100189z
日期:2010.7.2
A nucleophilicsubstitution of propargylicalcohols with carbon (arene, heteroarene, and allyltrimethylsilane), sulfur (thiol), oxygen (alcohol), and nitrogen (sulfonamide) nucleophiles has been demonstrated using a high-valent [Ir(COD)(SnCl3)Cl(μ-Cl)]2 catalyst in 1,2-dichloroethane to afford the corresponding propargylic products in moderate to excellent yields. Alkyl or aryl substituted tertiary
Synthesis of Propargylic Alcohols by base promoted Alkynylation of Ketones with Ethynylbenzene using Ionic Liquid [(bmim) PF<sub>6</sub>]
作者:Sachin R. Jagtap、Bhalchandra M. Bhanage
DOI:10.3184/030823407x225509
日期:2007.6
A mild and efficient addition of ethynylbenzene with ketones using KOH in ionic liquid 1-butyl-3-methylimidazolium hexaflurophosphate [(bmim) PF6] gives propargylic alcohols in high yields.