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Synthesis of Pyrroles via Consecutive 6π-Electrocyclization/Ring-Contraction of Sulfilimines

[Image: see text] We present a modular, synthetic entry to polysubstituted pyrroles employing readily available 2,5-dihydrothiophenes. Ring-opening of the heterocycle provides access to a panel of 1,3-dienes which undergo pyrrole formation in the presence of inexpensive chloramine-T trihydrate. The...

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Autores principales: Haut, Franz-Lucas, Feichtinger, Niklas J., Plangger, Immanuel, Wein, Lukas A., Müller, Mira, Streit, Tim-Niclas, Wurst, Klaus, Podewitz, Maren, Magauer, Thomas
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2021
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8227482/
https://www.ncbi.nlm.nih.gov/pubmed/34106724
http://dx.doi.org/10.1021/jacs.1c04835
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author Haut, Franz-Lucas
Feichtinger, Niklas J.
Plangger, Immanuel
Wein, Lukas A.
Müller, Mira
Streit, Tim-Niclas
Wurst, Klaus
Podewitz, Maren
Magauer, Thomas
author_facet Haut, Franz-Lucas
Feichtinger, Niklas J.
Plangger, Immanuel
Wein, Lukas A.
Müller, Mira
Streit, Tim-Niclas
Wurst, Klaus
Podewitz, Maren
Magauer, Thomas
author_sort Haut, Franz-Lucas
collection PubMed
description [Image: see text] We present a modular, synthetic entry to polysubstituted pyrroles employing readily available 2,5-dihydrothiophenes. Ring-opening of the heterocycle provides access to a panel of 1,3-dienes which undergo pyrrole formation in the presence of inexpensive chloramine-T trihydrate. The transformation is conducted in an open flask and proceeds at ambient temperatures (23 °C) in nondry solvents. A careful adjustment of the electronics and sterics of the 1,3-diene precursor allows for the isolation of key intermediates. DFT studies identified a reaction mechanism that features a 6π-electrocyclization of a sulfilimine intermediate followed by spontaneous ring-contraction to reveal the pyrrole skeleton.
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spelling pubmed-82274822021-06-25 Synthesis of Pyrroles via Consecutive 6π-Electrocyclization/Ring-Contraction of Sulfilimines Haut, Franz-Lucas Feichtinger, Niklas J. Plangger, Immanuel Wein, Lukas A. Müller, Mira Streit, Tim-Niclas Wurst, Klaus Podewitz, Maren Magauer, Thomas J Am Chem Soc [Image: see text] We present a modular, synthetic entry to polysubstituted pyrroles employing readily available 2,5-dihydrothiophenes. Ring-opening of the heterocycle provides access to a panel of 1,3-dienes which undergo pyrrole formation in the presence of inexpensive chloramine-T trihydrate. The transformation is conducted in an open flask and proceeds at ambient temperatures (23 °C) in nondry solvents. A careful adjustment of the electronics and sterics of the 1,3-diene precursor allows for the isolation of key intermediates. DFT studies identified a reaction mechanism that features a 6π-electrocyclization of a sulfilimine intermediate followed by spontaneous ring-contraction to reveal the pyrrole skeleton. American Chemical Society 2021-06-09 2021-06-23 /pmc/articles/PMC8227482/ /pubmed/34106724 http://dx.doi.org/10.1021/jacs.1c04835 Text en © 2021 The Authors. Published by American Chemical Society Permits the broadest form of re-use including for commercial purposes, provided that author attribution and integrity are maintained (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Haut, Franz-Lucas
Feichtinger, Niklas J.
Plangger, Immanuel
Wein, Lukas A.
Müller, Mira
Streit, Tim-Niclas
Wurst, Klaus
Podewitz, Maren
Magauer, Thomas
Synthesis of Pyrroles via Consecutive 6π-Electrocyclization/Ring-Contraction of Sulfilimines
title Synthesis of Pyrroles via Consecutive 6π-Electrocyclization/Ring-Contraction of Sulfilimines
title_full Synthesis of Pyrroles via Consecutive 6π-Electrocyclization/Ring-Contraction of Sulfilimines
title_fullStr Synthesis of Pyrroles via Consecutive 6π-Electrocyclization/Ring-Contraction of Sulfilimines
title_full_unstemmed Synthesis of Pyrroles via Consecutive 6π-Electrocyclization/Ring-Contraction of Sulfilimines
title_short Synthesis of Pyrroles via Consecutive 6π-Electrocyclization/Ring-Contraction of Sulfilimines
title_sort synthesis of pyrroles via consecutive 6π-electrocyclization/ring-contraction of sulfilimines
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8227482/
https://www.ncbi.nlm.nih.gov/pubmed/34106724
http://dx.doi.org/10.1021/jacs.1c04835
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