DBU-Promoted Nucleophilic Activation of Carbonic Acid Diesters
In: European journal of organic chemistry (Print), 2011, Heft 13, S. 2458-2465
Online
academicJournal
- print, 22 ref
Zugriff:
The reactivity of carbonic acid diesters in the presence of the amidine base DBU (1,8-diazabicyclo[5.4.0]undec-7-ene) has been investigated for the first time. Organic carbonates can be activated by DBU through the formation of N-alkoxycarbonyl ketene aminal 2 as the ultimate product. The latter species may form through deprotonation of the corresponding N-alkoxycarbonyl-amidinium cation 1+ by the amidine base. We have for the first time isolated and characterized, both in the solid state (X-ray crystal structure determination, IR) and in solution (NMR), a few 1+ chloride salts and studied their reactivity towards the organic base. The reactivity of both 1+ and 2 with methanol has also been explored. Ketene aminal 2 behaves as a CO2R carrier, as it can selectively transfer the alkoxycarbonyl group to the alcohol and regenerate the amidine base.
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DBU-Promoted Nucleophilic Activation of Carbonic Acid Diesters
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Autor/in / Beteiligte Person: | CARAFA, Marianna ; MESTO, Ernesto ; QUARANTA, Eugenio |
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Zeitschrift: | European journal of organic chemistry (Print), 2011, Heft 13, S. 2458-2465 |
Veröffentlichung: | Weinheim: Wiley-VCH, 2011 |
Medientyp: | academicJournal |
Umfang: | print, 22 ref |
ISSN: | 1434-193X (print) |
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