Preparation of 2-hydroxybenzamidines from 3-aminobenzisoxazoles
摘要:
2-Hydroxybenzamidines have been prepared from 3-aminobenzisoxazoles by reductive cleavage of the nitrogen-oxygen bond using catalytic hydrogenation, Zn/AcOH or NiCl2/NaBH4. This ring-opening reaction can be accomplished chemoselectively in the presence of a variety of hydrogenation-sensitive functional groups including an aryl bromide, benzyl carbamate, and olefin. (C) 2002 Published by Elsevier Science Ltd.
Indole-derivative modulators of steroid hormone nuclear receptors
申请人:Bell Gregory Michael
公开号:US20060235222A1
公开(公告)日:2006-10-19
The present invention provides a compound of formula I or a pharmaceutically acceptable salt thereof, pharmaceutical compositions comprising an effective amount of a compound of Formula I in combination with a suitable carrier, diluent, or excipient, and methods for treating physiological disorders, particularly congestive heart disease, comprising administering to a patient in thereof an effective amount of a compound of Formula I.
Phenolate‐Induced N−O Bond Formation versus Tiemann‐Type Rearrangement for the Synthesis of 3‐Aminobenzisoxazoles and 2‐Aminobenzoxazoles
作者:Benedikt Hufnagel、W. Felix Zhu、Hanna M. Franz、Ewgenij Proschak、Victor Hernandez‐Olmos
DOI:10.1002/open.202200252
日期:2022.12
intramolecular N−O bond formation and the competitive Tiemann-type rearrangement via oxadiazolones as cyclic nitrenoid precursors were developed. Selectivity for the two isomers was remarkably influenced by steric and electronic effects, but tetrabutylammonium chloride (TBACl) was discovered as an effective additive to promote the Tiemann-type rearrangement over N−O bond formation.