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Synthetic Applications of Bis(iminophosphoranes) – Preparation of Some Derivatives of the 11H-Quinazolino[2,3-b]- and Quinazolino[4,3-b]quinazoline Ring Systems

✍ Scribed by Molina, Pedro ;Conesa, Carlota ;de los Desamparados Velasco, M.

Publisher: John Wiley and Sons
Year: 1997
Tongue: English
Weight: 455 KB
Volume: 1997
Category: Article
ISSN: 0947-3440
DOI: 10.1002/jlac.199719970116

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✦ Synopsis

Abstract

Aza Wittig reaction of bis(iminophosphorane) 3 with two equivalents of aryl isocyanates directly provided the bicyclic guanidines 4. However, 3 undergoes intramolecular aza Wittig reaction on thermal treatment to give the iminophosphorane 6 derived from the 2‐(o‐azidophenyl)‐4(3__H__)‐quinazolinone. Compound 6 reacts with isocyanates, acyl chlorides and carbon disulfide to yield quinazolino[4,3‐b]quinazoline derivatives 8a–c, 9a–c, 10, and 11.

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