Synthesis of indazole-N-oxides via the 1,7-electrocyclization of azomethine ylides
摘要:
The first examples of the 1,7-electrocyclization of azomethine ylides onto a nitro group, to give benz-1,2,6-oxadiazepine intermediates are reported. Subsequent ring contraction results in the formation of indazole-N-oxides. (C) 2004 Elsevier Ltd. All rights reserved.