Silver-Assisted [3 + 2] Annulation of Nitrones with Isocyanides: Synthesis of 2,3,4-Trisubstituted 1,2,4-Oxadiazolidin-5-ones
摘要:
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-S-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.
Cycloadducts of nitrones with isocyanates; 1,2,4- or 1,3,4-oxadiazolidinones?
作者:Anthony M. T. Bell、Jonathan Bridges、Richard Cross、Christopher P. Falshaw、Brian F. Taylor、Giles A. Taylor、Ian C. Whittaker、Michael J. Begley
DOI:10.1039/p19870002593
日期:——
The adducts formed between various aryl-substituted nitrones and aryl isocyanates have been shown, using 15N n.m.r. spectroscopy and X-ray crystallography, to be substituted 1,2,4-oxadiazolidinones and not the previously reported 1,3,4-oxadiazolinones.
使用15 N nmr光谱法和X射线晶体学显示,各种芳基取代的硝酮与芳基异氰酸酯之间形成的加合物被取代的1,2,4-恶二唑烷酮,而不是先前报道的1,3,4-恶二唑啉酮。
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作者:Seidl,H. et al.
DOI:——
日期:——
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作者:Angeli、Castellana
DOI:——
日期:——
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作者:Zalupsky,P. et al.
DOI:——
日期:——
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