Xiaofang Wang et al.
UPDATES
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Experimental Section
General Procedure
A 50-mL three-necked flask was fitted with a condenser and
charged with nitroarene (15 mmol), base (5.0 mmol), H2O
(0.5 mL), selenium (0.38 mmol), and DMF (10 mL), and was
then placed in an oil bath preheated at 958C. Carbon monoxide
(20 mL/min) was bubbled into the reaction mixture with vigo-
rous stirring for the stated time. After cooling to ambient tem-
perature, the resultant mixture was exposed to air and further
stirred for about two hours. The mixture was filtered to recover
seleniumand water (50 mL) was then poured into the filtrate to
precipitae the crude product. Purification by column chroma-
tography on silica gel using Et2O-AcOEt (20:1 to 10:1) as
the eluent afforded the urea product. Products were identified
by NMR and HPLC-MS measurements and/or comparison
with authentic samples.
Acknowledgements
We are grateful for financial support from the Innovation Fund-
ing of the Chinese Academy of Sciences, P. R. China.
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932
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asc.wiley-vch.de
Adv. Synth. Catal. 2004, 346, 929 932