Ti-mediated intramolecular cyclopropanation of N-alkenyl thioamides: scope and mechanistic study |
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Authors: | Fabien Hermant Emmanuel Nicolas Yvan Six |
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Affiliation: | 1. Laboratoire de Synthèse Organique (DCSO), UMR 7652 CNRS/Ecole Polytechnique, Route de Saclay, 91128 Palaiseau Cedex, France;2. Laboratoire de Chimie Moléculaire (LCM), UMR 9168 CNRS/Ecole Polytechnique, 91128 Palaiseau Cedex, France |
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Abstract: | Although thioamides generally undergo a reductive alkylation process when they are treated with a Grignard reagent in the presence of Ti(OiPr)4, substrates fitted with a but-3-enyl substitution at the nitrogen atom are shown to be converted into bicyclic aminocyclopropanes. These reactions are compared with the similar cyclisations of the corresponding carboxylic amide substrates. A mechanistic study is provided. Coincidently, new reagent systems are identified for the mediation of the same transformation. |
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Keywords: | Kulinkovich-type reactions Thioamides Aminocyclopropanes Grignard reagents Diastereoselectivity |
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