Indium mediates a Barbier-type reaction between alkynyl halides and aldehydes or ketones to give secondary or tertiary propargyl alcohols. Secondary alcohols can be oxidised in situ according an Oppenauer process. (C) 20021 Elsevier Science Ltd. All rights reserved.
Regioselective Synthesis of Isocoumarins via Iridium(III)-Catalyzed Oxidative Cyclization of Aromatic Acids with Propargyl Alcohols
作者:Pinki Sihag、Masilamani Jeganmohan
DOI:10.1021/acs.joc.8b03077
日期:2019.3.1
An Ir(III)-catalyzed oxidative cyclization of benzoic acids with propargyl alcohols to give substituted isocoumarins in a highly regioselective manner is described. This protocol has a broad substrate scope with high functional group tolerance. The observed isocoumarins were converted into biologically active tetracyclic indeno[2,1-c]isocoumarins by Lewis acid-mediated cyclization. A possible reaction
描述了用炔丙基醇进行的Ir(III)催化的苯甲酸氧化环化反应,以高度区域选择性的方式生成取代的异香豆素。该协议具有广泛的底物范围,具有较高的官能团耐受性。通过路易斯酸介导的环化作用将观察到的异香豆素转化为具有生物活性的四环茚并[ 2,1- c ]异香豆素。提出了一种可能的反应机理,并由详细的机理研究和DFT大力支持。
Microwave-Assisted Organocatalyzed Rearrangement of Propargyl Vinyl Ethers to Salicylaldehyde Derivatives: An Experimental and Theoretical Study
作者:David Tejedor、Leandro Cotos、Daniel Márquez-Arce、Mikel Odriozola-Gimeno、Miquel Torrent-Sucarrat、Fernando P. Cossío、Fernando García-Tellado
DOI:10.1002/chem.201503171
日期:2015.12.7
monocycles to complex fused polycyclic systems. The reaction is highly regioselective and takes place under symmetry‐breaking conditions. The preparative power of this reaction was demonstrated in the first total synthesis of morintrifolin B, a benzophenone metabolite isolated from the small tree Morinda citrifolia L. A DFT study of the reaction was performed with full agreement between calculated values and
Regio‐ and Stereoselective Synthesis of 2‐Hydroxymethyl‐1,3‐enynes by Rhodium‐Catalyzed Decarboxylative C−C Coupling
作者:Shi‐Chao Lu、Zhi‐Xin Chang、Yu‐Liang Xiao、Hong‐Shuang Li
DOI:10.1002/adsc.201901013
日期:2019.10.22
A regio‐ and stereoselective protocol for rhodium(I)‐catalyzeddecarboxylativeC−Ccoupling between propiolic acids and propargyl alcohols has been achieved. This efficient catalytic approach could facilitate the preparation of a diversity of synthetically valuable 2‐hydroxymethyl‐1,3‐enynes with high Z‐stereoselectivity. Notably, non‐terminal alkynes were smoothly transformed into the target products
Organocatalytic cycloaddition of carbonyl sulfide with propargylic alcohols to 1,3-oxathiolan-2-ones
作者:Hui Zhou、Rui Zhang、Hui Zhang、Sen Mu、Xiao-Bing Lu
DOI:10.1039/c9cy00062c
日期:——
adducts of a Lewis base (LB) were synthesized and first used to catalyze the cycloaddition of COS with propargylic alcohols under mild reaction conditions, selectively providing the functionalized 1,3-oxathiolane-2-ones with complete (Z) configuration selectivity. Among them, COS adducts of highly polarized olefins proved to be highly efficientorganocatalysts for this transformation, with excellent yields
DFT and experimental studies on Rh(III)-catalyzed dual directing-groups-assisted [3+2] annulation and ring-opening of N‑aryloxyacetamides with 1-(phenylethynyl)cycloalkanol
tanol underrhodium (III) catalysis. The impact of substrates with different ring numbers on the reaction mechanism has been discussed in detail. When the ring number exceeds 4, 1-(phenylethynyl)cycloalkanol simply conducts [3+2] annulation like the general reaction between N-aryloxyacetamides and alkyne. When the ring number is equal to 4, 1-(phenylethynyl)cyclobutanol undergoes cascade [3+2] annulation