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 %).
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.
Enolizable Carbonyls and <i>N</i>
,<i>O</i>
-Acetals: A Rational Approach for Room-Temperature Lewis Superacid-Catalyzed Direct α-Amidoalkylation of Ketones and Aldehydes
作者:Bahria Touati、Abderrahman El Bouakher、Catherine Taillier、Raja Ben Othman、Malika Trabelsi-Ayadi、Sylvain Antoniotti、Elisabet Duñach、Vincent Dalla
DOI:10.1002/chem.201504772
日期:2016.4.18
carbonyl donors, that is, ketones and aldehydes with unbiased N,O‐acetals, is described. Sn(NTf2)4 is an optimal catalyst to promote this challenging transformation at low loading and the reaction shows promising scope. A comprehensive and rational evaluation of this reaction has led to the establishment of an empirical scale of nucleophilic reactivity for a broad set of ketones that should be helpful
Calcium(II)-Catalyzed Alkenylation of<i>N</i>-Acyliminiums and Related Ions with Vinylboronic Acids
作者:Chenxiao Qi、Vincent Gandon、David Lebœuf
DOI:10.1002/adsc.201700214
日期:2017.8.7
Efficient C−C bond‐forming reactions between N,O‐acetals and vinylboronicacids were achieved via a calcium(II)‐catalyzed formation of a N‐acyliminium intermediate or a related ion. This strategy can give a rapid access to a wide variety of alkenyl‐functionalized nitrogen‐containing compounds in good to excellent yields under simple reaction conditions.