Reactivity of indole-3-alkoxides in the absence of acids: Rapid synthesis of homo-bisindolylmethanes
作者:Bhavani Shankar Chinta、Beeraiah Baire
DOI:10.1016/j.tet.2016.10.067
日期:2016.12
properties of the alkoxides offered the direct and selective construction of bisindolylmethanes and indole-3-carbinols. This process shows very broad scope and represents the reagent (external) free, greener synthesis of structurally divergent bisindolylmethanes.
Catalytic Enantioselective Quick Route to Aldol-Tethered 1,6- and 1,7-Enynes from ω-Unsaturated Aldehydes
作者:Jesús M. García、José M. Odriozola、Jesús Razkin、Irati Lapuerta、Amaiur Odriozola、Iñaki Urruzuno、Silvia Vera、Mikel Oiarbide、Claudio Palomo
DOI:10.1002/chem.201404452
日期:2014.11.17
developed based on a direct cross‐aldol reaction between ω‐unsaturated aldehydes and propargylic aldehydes (α,β‐ynals) promoted by combined α,α‐dialkylprolinol ether/Brønsted acid catalysis. This synergistic activation strategy is key to accessing the corresponding aldol adducts with high stereoselectivity, both enantio‐ and diastereoselectivity. The aldol reaction also proceeds well with propargylic ketones
Cu(I)-Catalyzed Regioselective Synthesis of Polysubstituted Furans from Propargylic Esters via Postulated (2-Furyl)carbene Complexes
作者:José Barluenga、Lorena Riesgo、Rubén Vicente、Luis A. López、Miguel Tomás
DOI:10.1021/ja8058342
日期:2008.10.15
Polysubstituted furan derivatives are regioselective obtained from (bis-alkynyl)methyl carboxylates in the presence of catalytic amounts of copper(I) salts. This multistep process is consistent with the intermediacy of a copper(I) (2-furyl)carbene complex which is intercepted by suitable trapping reagents.
Gold‐Catalyzed Cyclizations and [3+2]‐Annulation Cascades between 1,5‐Diyn‐3‐ols and Nitrones to Construct Carbazole Frameworks
作者:Sudhakar Dattatray Tanpure、Manoj Dilip Dhole、Rai‐Shung Liu
DOI:10.1002/adsc.202300711
日期:2023.9.5
Gold-catalyzedcascade reactions between 1,5-diyn-3-ols and nitrones to deliver carbazole derivatives are described. Such cascade reactions are applicable to facile synthesis of polyaromatic compounds containing carbazole subunits. Notably, the reaction mechanism involves unexpected oxoarylations, rather than oxidative Mannich reactions as known for but-1-yn-4-ols. Our control experiments indicate
Gold-Catalyzed [4 + 1]-Annulation Reactions between 1,4-Diyn-3-ols and Isoxazoles To Construct a Pyrrole Core
作者:Rahul Dadabhau Kardile、Balaji S. Kale、Pankaj Sharma、Rai-Shung Liu
DOI:10.1021/acs.orglett.8b01398
日期:2018.7.6
This work reports gold-catalyzed [4 + 1]-annulation reactions between 1,4-diyn-3-ols and isoxazoles or benzisoxazoles to yield pyrrole derivatives. The reaction chemoselectivity is controlled by an initial attack of an isoxazole at a less hindered alkyne to form gold carbenes, further inducing a 1,2-migration of a second alkyne group. A broad substrate scope of 1,4-diyn-3-ols, isoxazoles and even benzisoxazoles highlighted the reaction utility.