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Abstract
Iminobenzoxazines (2) react with pyrrolidine in EtOAc at reflux to give amidine carboxamides (11), which cyclize to quinazolinones (3) on heating in 99:1 MeCN/HOAc. However, both amidines (11d) and (13d) are formed if R 1 = Ar and R 2 = Me. Hindered amidine (11f), R 1 = Ph, R 2 = i-Pr, does not cyclize to give quinazolinone (3f).
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