| http://www.w3.org/ns/prov#value | - A suitable sodium salt of an enamine (II) is reacted with an isocyanate or isothiocyanate (III) at low temperature, typically between -50??? C. and -70??? C. in an inert solvent such as tetrahydrofuran or dimethylformamide and the reaction allowed to come to ambient temperature over several hours.
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