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Synthesis 2018; 50(04): 853-858
DOI: 10.1055/s-0036-1591852
DOI: 10.1055/s-0036-1591852
paper
Synthesis of Acetylenic Amides with Propyllactam Moieties by In Situ DBU or DBN Ring-Opening Rearrangement in the Presence of Acetylenic Esters
Further Information
Publication History
Received: 21 July 2017
Accepted after revision: 07 November 2017
Publication Date:
07 December 2017 (online)
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Abstract
DBN (1,5-diazabicyclo[4.3.0]non-5-ene) and DBU (1,8-diazabicyclo[5.4.0]undec-7-ene) react with methyl esters of acetylenic acids and excess water (the reactant molar ratio 1:1, in aqueous MeCN, at 20–25 °C, for 48 h) to afford acetylenic amides with pyrrolidone and caprolactam moieties in 89–100% yields. The synthesis involves amines formed in situ from the cyclic amidines, which further react with acetylenic esters.
Key words
DBN (1,5-diazabicyclo[4.3.0]non-5-ene) - DBU (1,8-diazabicyclo[5.4.0]undec-7-ene) - acetylenic acid esters - acetylenic amides - lactamSupporting Information
- Supporting information for this article is available online at https://doi.org/10.1055/s-0036-1591852.
- Supporting Information
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