Synthese von 2‐Methyl‐4 H ‐1,3‐benzoxazin‐4‐onen und analogen Verbindungen | Zendy

Stegmann Hartmut B. | Zendy; Klotz Dieter | Zendy; Weiß Joachim E. | Zendy

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Synthese von 2‐Methyl‐4 H ‐1,3‐benzoxazin‐4‐onen und analogen Verbindungen

Author(s) -

Stegmann Hartmut B.,

Klotz Dieter,

Weiß Joachim E.

Publication year - 1985

Publication title -

chemische berichte

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.667

H-Index - 136

eISSN - 1099-0682

pISSN - 0009-2940

DOI - 10.1002/cber.19851181136

Subject(s) - chemistry , intramolecular force , wittig reaction , medicinal chemistry , condensation , stereochemistry , organic chemistry , physics , thermodynamics

Synthesis of 2‐Methyl‐4 H ‐1,3‐benzoxazin‐4‐ones and Related Compounds 4 H ‐1,3‐benzoxazin‐4‐ones 2 are smoothly prepared via (acylimino)phosphoranes 1 by intramolecular condensation analogous to a Wittig reaction. Tert. phosphanes are used for the preparation of the (acylimino)phosphoranes 1 which are converted into the corresponding benzoxazines and tert. phosphane oxides, e.g. 2‐methyl‐4 H ‐1,3‐benzoxazin‐4‐one ( 2a ) which, in spite of some attempts, has not been obtained before.

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