Bottom-Up Synthesis of Supported Thioureas and Their Use in Enantioselective Solvent-Free Aza-Henry and Michael Additions

Two sets of supported chiral thioureas, which differ in the length of the tether that connects the chiral appendage to the polymer structure and the effective functionalization, have been prepared by copolymerization of styrene, novel styryl thioureas derived from l‐valine, and divinylbenzene. The e...

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Veröffentlicht in:ChemPlusChem (Weinheim, Germany) Germany), 2016-01, Vol.81 (1), p.86-92
Hauptverfasser: Andrés, José M., de La Cruz, Noelia, Valle, María, Pedrosa, Rafael
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creator Andrés, José M.
de La Cruz, Noelia
Valle, María
Pedrosa, Rafael
description Two sets of supported chiral thioureas, which differ in the length of the tether that connects the chiral appendage to the polymer structure and the effective functionalization, have been prepared by copolymerization of styrene, novel styryl thioureas derived from l‐valine, and divinylbenzene. The efficiency of these polymeric thioureas has been tested in two different enantioselective transformations, namely, aza‐Henry and nitro‐Michael reactions, in neat reaction conditions. The obtained results show that it is possible to recycle the thiourea, and they are able to promote the reactions with good enantioselectivity at a low catalyst loading. Undiluted catalytic power: Supported bifunctional thioureas, prepared by a bottom‐up methodology, promote highly enantioselective aza‐Henry and nitro‐Michael reactions under solvent‐free conditions (see scheme; Boc=tert‐butyloxycarbonyl, d.r.=diastereomeric ratio, e.r.=enantiomeric ratio).
doi_str_mv 10.1002/cplu.201500476
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subjects Chemistry
Chromatography
enantioselectivity
Michael addition
organocatalysis
Polymerization
supported catalysts
thioureas
title Bottom-Up Synthesis of Supported Thioureas and Their Use in Enantioselective Solvent-Free Aza-Henry and Michael Additions
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