Simple and efficient syntheses of 2-hydroxy-3H-phenoxazin-3-ones by aerobic oxidative cross-cyclocondensation in water†
Zhan-Ting
Li 
*b
and
Guanyu
Yang
*a
*b
and
Guanyu
Yang
*a
Abstract
A novel, simple and versatile synthetic approach that utilized natural renewable low-toxic gallic acid as an organocatalyst was developed for efficient aerobic oxidative cross-cyclocondensations of equimolar 2-aminophenols and 2-hydroxylphenols to afford various 2-hydroxy-phenoxazin-3-ones with moderate to high isolated yields at room temperature in water.
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