Enantioselective Synthesis of Chromanones via a Peptidic Phosphane Catalyzed Rauhut–Currier Reaction
摘要:
The enantioselective intramolecular Rauhut-Currier reaction has been developed using a bifunctional dipeptidic phosphane catalyst, providing a direct access to biologically active alpha-methylene-delta-valerolactones in high yields and enantiomeric excesses. The novel catalyst is accessible in only four steps, from commercial sources and exhibits unusual binding selectivities for a small molecule, suggesting the possibility for long-range interactions between the catalyst and the substrate.
A series of chiral phosphine‐imine ligands were synthesized starting with α‐amino acids and examined for palladium‐catalyzed asymmetric addition of arylboronic acids to cyclic N‐sulfonylimines. High catalytic activities (up to 99% yield) and high enantioselectivities (up to 98% ee) were achieved for cyclic N‐sulfonyl aldimines and ketimines with five and six‐membered ring structures.
作者:Raquel Mato、Rubén Manzano、Efraim Reyes、Luisa Carrillo、Uxue Uria、Jose L. Vicario
DOI:10.1021/jacs.9b03679
日期:2019.6.19
Catalytic and enantioselective approaches to transannular reactions are very limited and mostly are based on chiral Lewis acid catalyzed pericyclic reactions. In this report, we present an efficient and straightforward methodology to access bicyclic carbo- and heterocyclic scaffolds combining different ring sizes through transannular Morita-Baylis-Hillman reaction catalyzed by a chiral enantiopure
Highly Enantioselective Intermolecular Cross Rauhut-Currier Reaction Catalyzed by a Multifunctional Lewis Base Catalyst
作者:Xuelin Dong、Ling Liang、Erqing Li、You Huang
DOI:10.1002/anie.201409744
日期:2015.1.26
The highlyenantioselective intermolecular cross Rauhut–Currier reaction of different active olefins catalyzed by a multifunctional chiral Lewisbase was reported. The RC products were obtained in excellent yields (up to 98 %), high chemo‐ and enantioselectivity (up to 96 % ee). The reaction could be performed on a gram scale using 1 mol % of the multifunctional phosphine catalyst.
A highly enantioselective intramolecularRauhut-Currierreaction catalyzed by a multifunctionalchiral aminophosphine catalyst was reported. A series of hydro-2H-indole derivatives that bear an all-carbon quaternary center were obtained in high yields (up to 94%), excellent diastereo- and enantioselectivity (up to >20:1 d.r. and >99% ee). And this reaction could be performed on a gram scale using 2