Atom-Economic Catalytic Direct Substitution of N,O-Acetals with Simple Ketones
作者:Bahria Touati、Abderrahman El Bouakher、Mohamed Salah Azizi、Catherine Taillier、Raja Ben Othman、Malika Trabelsi-Ayadi、Sylvain Antoniotti、Elisabet Duñach、Vincent Dalla
DOI:10.1002/ejoc.201700530
日期:2017.8.17
protocol for the direct amidoalkylation of simple enolizable ketones with use of Lewis superacid Sn(NTf2)4 as a catalyst is described. Couplings of a large set of both carbonyl and N,O-acetalic substrates (mostly the simplest OH-hemiaminals) proceed with very low catalyst loadings (≤ 1 mol-%) and provide the corresponding amidoalkylated ketones in high yields (up to 99 %).
In(OTf)<sub>3</sub>-Catalyzed One-Pot Tandem Mannich and Conia-Ene Cyclization Reaction of <i>N</i>-Propargyl Amido Alcohols with 1,3-Dicarbonyl Compounds: An Approach To Construct Tetrahydro-1<i>H</i>-pyrrolo[2,1-<i>a</i>]isoindolone-1,1-dicarboxylate and Its Application
作者:Archana Kumari Sahu、Ramanjaneyulu Unnava、Sudip Shit、Anil K. Saikia
DOI:10.1021/acs.joc.9b02686
日期:2020.2.21
A one-pottandemreaction has been developed for the synthesis of substituted tetrahydropyrroloisoindolone via Mannich reaction of N-propargyl amido alcohols with 1,3-dicarbonyl compounds followed by Conia-ene cyclization reaction in moderate to good yields catalyzed by indium(III)triflate [In(OTf)3]. The reaction is highly regioselective with an exo-cyclic double bond in the pyrrolidinering. The
One-Pot Hydroxy Group Activation/Carbon-Carbon Bond Forming Sequence Using a Brønsted Base/Brønsted Acid System
作者:Alice Devineau、Guillaume Pousse、Catherine Taillier、Jérôme Blanchet、Jacques Rouden、Vincent Dalla
DOI:10.1002/adsc.201000602
日期:2010.11.22
distinct feature of the trichloroacetimidate group allows use of weaker acid catalysts such as 1,1′-bi-2-naphthol (BINOL)-derived phosphoric acid, pointing out the possible development of an enantioselective variant. This unprecedented sequential one-potBrønsted base-Brønsted acid catalysis further expands the synthetic scope of the trichloroacetimidate group.