ChemInform Abstract: The Preparation of Substituted 5H‐Pyrazolo(1,5‐c)(1,3)benzoxazin‐5‐ones from the Trianions of Certain Hydroxyphenylcarboethoxyhydrazones.

Abstract

197 ChemInform Abstract The hydrazones (I) are treated with excess LDA to generate trilithium salts which are coupled with the salicylates (II) and directly subjected to acid-promoted ring closure, forming the pyrazolobenzoxazinones (III).