Abstract Arylurea and their analogues have been one of the most ubiquitous backbone during the past century, and extensive studies have been conducted to establish practical synthetic methods for their derivatives. In particular, it is an effective pathway to synthesize arylureas by using commercially available phthalimide compounds. Reported herein is a triethoxyphosphine promoted ring-opening of the N-hydroxyphthalimide
Direct Access to 2‐Aminobenzoxazinones via Ph
<sub>3</sub>
P‐I
<sub>2</sub>
Mediated Deoxygenative Amination of Isatoic Anhydrides with Tertiary Amines
Under ultrasonic irradiation, tertiary amines react rapidly with Ph3P-I2-activated isatoic anhydrides to afford 2-amino-substituted benzoxazinones regioselectively without competing C-4 substitution. Spectroscopic evidence suggests that the reaction proceeds through C2 activation of isatoic anhydrides, followed by amine substitution-N-dealkylation sequence.