A F reagent-mediated direct C-H carbamoylation of quinoxalin-2(1H)-ones has been developed. Under roomtemperature, a variety of isocyanides are employed to couple well with quinoxalin-2(1H)-ones affording 42 examples including 30 new compounds. This metal-free mild strategy tolerates a wide range of functional groups and shows environmental friendliness and practicality.
[EN] TETRAZOLE COMPOUNDS AS CALCIUM CHANNEL BLOCKERS<br/>[FR] COMPOSÉS DE TÉTRAZOLE COMME BLOQUEURS DES CANAUX CALCIQUES
申请人:CONVERGENCE PHARMACEUTICALS
公开号:WO2012004604A1
公开(公告)日:2012-01-12
The present invention relates to novel tetrazole compounds; to processes for their preparation; to pharmaceutical compositions containing the compounds; and to the use of the compounds in therapy to treat diseases for which blocking the Cav2.2 calcium channels is beneficial. Formula (I) wherein A is: (II) or (III)
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.