Abstract
A new and convenient method for the preparation of 3,4-dihydroquinazolines 5 with aryl and Ac groups at C(2) and N(3), respectively, has been developed. The key sequence is the formation of aza-phosphorane intermediates by the reaction of N-[2-(azidomethyl)phenyl]benzamides 1 with Ph3P, followed by intramolecular aza-Wittig reaction and 3-acetylation, which can be conducted in one-pot.
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