2020
DOI: 10.1021/acs.joc.9b03279
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Silver-Assisted [3 + 2] Annulation of Nitrones with Isocyanides: Synthesis of 2,3,4-Trisubstituted 1,2,4-Oxadiazolidin-5-ones

Abstract: A silver-assisted method for [3 + 2] annulation of nitrones with isocyanides has been developed. The developed protocol allows access to a variety of 2,3,4-trisubstituted 1,2,4-oxadiazolidin-5-one derivatives as single diastereomers in good to excellent yields using silver oxide as the catalyst and molecular oxygen as the terminal oxidant. A plausible mechanism involving a nucleophilic addition/cyclization/protodeargentation/oxidation pathway is proposed on the basis of experimental results.

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Cited by 19 publications
(5 citation statements)
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“…Kärkäs, Liu and co‐workers reported a [3+2] cycloaddition of nitrones 111 with isocyanides 112 affording a variety of 2,3,4‐trisubstituted 1,2,4‐oxadiazolidin‐5‐one derivatives 113 as single diastereomers in good to excellent yields using silver oxide as the catalyst and molecular oxygen as the terminal oxidant (Scheme 13a) [24] . A cascade mechanistic pathway of nucleophilic addition/cyclization/protodeargentation/oxidation was proposed, as shown in Scheme 13b.…”
Section: Synthesis Of Five‐membered Heterocyclic Compoundsmentioning
confidence: 99%
“…Kärkäs, Liu and co‐workers reported a [3+2] cycloaddition of nitrones 111 with isocyanides 112 affording a variety of 2,3,4‐trisubstituted 1,2,4‐oxadiazolidin‐5‐one derivatives 113 as single diastereomers in good to excellent yields using silver oxide as the catalyst and molecular oxygen as the terminal oxidant (Scheme 13a) [24] . A cascade mechanistic pathway of nucleophilic addition/cyclization/protodeargentation/oxidation was proposed, as shown in Scheme 13b.…”
Section: Synthesis Of Five‐membered Heterocyclic Compoundsmentioning
confidence: 99%
“…In 2020, Kärkäs, Liu and co-workers developed a silver-assisted method for the [3 + 2] cycloaddition of isocyanides with nitrones 25 (Scheme 7). 25 The developed protocol allowed access to a variety of 1,2,4-oxadiazolidin-5-one derivatives 27 as single diastereomers in good to excellent yields. In the process, a stepwise cycloaddition is proposed, and the cycloaddition provides a key intermediate 29 .…”
Section: Cyclization With 13-dipolarsmentioning
confidence: 99%
“…Kärkäs, Liu, and co-workers developed a [3+2] annulation of nitrones 161 and isocyanides to yield a variety of 2,3,4-trisubstituted 1,2,4-oxadiazolidin-5-one derivatives 164 (Scheme 50). 112 The reaction was carried out by using silver oxide as the catalyst and molecular oxygen as the terminal oxidant. Based on empirical results a mechanism was proposed that includes a nucleophilic addition/cyclization/protodeargentation/oxidation pathway.…”
Section: Special Topic Synthesismentioning
confidence: 99%