Fe(III)/l-Valine-Catalyzed One-Pot Synthesis of N-Sulfinyl- and N-Sulfonylimines via Oxidative Cascade Reaction of Alcohols with Sulfinamides or Sulfonamides
An efficient Fe(III), l -valine, and 4-OH-TEMPO catalytic system was found for the oxidation of alcohols followed by condensation with sulfinamide or sulfonamide in one pot for the synthesis of N-sulfinyl- and N-sulfonylimines compounds under mild conditions. This transformation accommodates a variety of substrates, shows high functional-group tolerance, and affords the corresponding products in good
Enantioselective C--C bond formation to 2-pyridinesulfonylimines afforded products with good enantioselectivity. Dynamic induction of chirality on the sulfur by coordination of a chiral Lewis acid to the pyridine nitrogen and one of the prochiral sulfonyl oxygens induces enantioselectivity. Since the 2-pyridinesulfonyl group can easily be removed after the reaction, it acts not only as an activating
Enantioselective Continuous-Flow Production of 3-Indolylmethanamines Mediated by an Immobilized Phosphoric Acid Catalyst
作者:Laura Osorio-Planes、Carles Rodríguez-Escrich、Miquel A. Pericàs
DOI:10.1002/chem.201303860
日期:2014.2.17
polystyrene‐supported 1,1’‐bi‐2‐naphthol derived phosphoricacid has been synthesized and applied in the enantioselective Friedel–Crafts reaction of indoles and sulfonylimines. The immobilizedcatalyst was highly active and selective, and gave rise to a broad range of 3‐indolylmethanamines (19 examples) in high yields and excellent enantioselectivities (up to 98 % enantiomeric excess) after short reaction
Substrate-Controlled Diastereoselectivity Switch in Catalytic Asymmetric Direct Mannich Reaction of Glycine Derivatives with Imines: From<i>anti</i>- to<i>syn</i>-α,β-Diamino Acids
作者:Jorge Hernández-Toribio、Ramón Gómez Arrayás、Juan Carlos Carretero
DOI:10.1002/chem.200902258
日期:2010.1.25
diastereoselectivity switch has been devised in the Fesulphos–CuI‐catalyzed glycine direct Mannich reaction with N‐(8‐quinolyl)sulfonyl imines by tuning the steric and electronic properties of the glycine component (see scheme). α,β‐Diaminoacids of syn configuration are produced under high diastereo‐ and enantiocontrol with glycinate esters derived from electron‐deficient benzophenone‐type ketimines, in contrast
Direct Mannich Reaction of Glycinate Schiff Bases with <i>N</i>-(8-Quinolyl)sulfonyl Imines: A Catalytic Asymmetric Approach to <i>anti</i>-α,β-Diamino Esters
作者:Jorge Hernández-Toribio、Ramón Gómez Arrayás、Juan C. Carretero
DOI:10.1021/ja807583n
日期:2008.12.3
An efficient catalytic enantioselective direct Mannich reaction of glycinate Schiff bases with aryl imines leading to anticonfigured orthogonally protected alpha,beta-diaminoesters has been realized. Keys to success in this new catalyst system are the use of Fesulphos/Cu(CH3CN)4PF6 (3-5 mol%) as a Lewis acid catalyst and readily available N-(8-quinolyl)sulfonyl-protected aldimines as substrates, affording