Internal Nucleophilic Catalyst Mediated Cyclisation/Ring Expansion Cascades for the Synthesis of Medium‐Sized Lactones and Lactams

A strategy for the synthesis of medium‐sized lactones and lactams from linear precursors is described in which an amine acts as an internal nucleophilic catalyst to facilitate a novel cyclisation/ring expansion cascade sequence. This method obviates the need for the high‐dilution conditions usually...

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Veröffentlicht in:Angewandte Chemie 2019-09, Vol.131 (39), p.14080-14085
Hauptverfasser: Lawer, Aggie, Rossi‐Ashton, James A., Stephens, Thomas C., Challis, Bradley J., Epton, Ryan G., Lynam, Jason M., Unsworth, William P.
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container_end_page 14085
container_issue 39
container_start_page 14080
container_title Angewandte Chemie
container_volume 131
creator Lawer, Aggie
Rossi‐Ashton, James A.
Stephens, Thomas C.
Challis, Bradley J.
Epton, Ryan G.
Lynam, Jason M.
Unsworth, William P.
description A strategy for the synthesis of medium‐sized lactones and lactams from linear precursors is described in which an amine acts as an internal nucleophilic catalyst to facilitate a novel cyclisation/ring expansion cascade sequence. This method obviates the need for the high‐dilution conditions usually associated with medium‐ring cyclisation protocols, as the reactions operate exclusively via kinetically favourable “normal”‐sized cyclic transition states. This same feature also enables biaryl‐containing medium‐sized rings to be prepared with complete atroposelectivity by point‐to‐axial chirality transfer. Zwei Stufen auf einmal: Die Synthese mittlerer Lactone und Lactame aus linearen Substraten wurde durch die Verwendung eines Amins als internem nucleophilem Katalysator einer Cyclisierungs‐Ringerweiterungs‐Kaskade ermöglicht. Diese Reaktion gelingt ohne hohe Verdünnung und ermöglicht die Herstellung von Biarylgerüsten in mittleren Ringen mit vollständiger Kontrolle der Atroposelektivität.
doi_str_mv 10.1002/ange.201907206
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subjects Atropisomere
Axiale Chiralität
Catalysis
Catalysts
Chemistry
Chirality
Dilution
Lactones
Mittlere Ringe
Pyridine
Ringerweiterungen
title Internal Nucleophilic Catalyst Mediated Cyclisation/Ring Expansion Cascades for the Synthesis of Medium‐Sized Lactones and Lactams
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