Silver-Assisted [3 + 2] Annulation of Nitrones with Isocyanides: Synthesis of 2,3,4-Trisubstituted 1,2,4-Oxadiazolidin-5-ones
作者:Xuanyu Shen、Andrey Shatskiy、Yan Chen、Markus D. Kärkäs、Xiang-Shan Wang、Jian-Quan Liu
DOI:10.1021/acs.joc.9b03279
日期:2020.3.6
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.
Zalupsky,P. et al., Collection of Czechoslovak Chemical Communications, 1976, vol. 41, p. 3799 - 3803
作者:Zalupsky,P. et al.
DOI:——
日期:——
A Convenient Synthesis of Amidines via Cycloaddition–Decarboxylation of Isocyanates and Nitrones
作者:Mei-Mei Zhang、Yijing Wu、Xinyi Chen
DOI:10.1055/s-0040-1707989
日期:2020.6
base-promoted reaction between isocyanates and nitrones has been described, allowing an access to a variety of important functionalized amidines under mild reaction conditions. This strategy provides a convenient, effective, and scalable approach for the direct assembly of amidine compounds from simple starting materials in excellent yields.