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26060-06-0

2-(2-THIENYL)-4H-3,1-BENZOXAZIN-4-ONE synthesis

10synthesis methods
-

Yield:26060-06-0 99%

Reaction Conditions:

with acetic anhydride;triethylamine in ethyl acetate;

Steps:

1 2-(2'-THIENYL)-4H-3,1-BENZOXAZIN-4-ONE

Example 1 2-(2'-THIENYL)-4H-3,1-BENZOXAZIN-4-ONE A solution of anthranilic acid (2.0 g, 15 mmol), 2-thienylcarbonyl chloride (2.2 g, 15 mmol), and triethylamine (1.5 g, 15 mmol) in ethyl acetate (9 mL) was stirred for 1 h. The solution was filtered and concentrated to a solid (3.7 g, 99%). The solid (1 g, 4 mmol) was heated at reflux with acetic anhydride (20 mL) for 18 h. The reaction mixture was concentrated, washed with water, and dried to give the title compound (0.92 g, 99%); m.p. 129-130° C.

References:

US5939421,1999,A

4298-52-6 Synthesis
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