Abstract
N-tert-Butyloxycarbonylamino-3-[Z-α-(2,5-dimethyl-3-thienyl)ethylidene]-4-isopropylidenepyrrolidine-2,5-dione was prepared in 80% yield from the corresponding isomeric hydrazidic acids using N,N’-carbonyldiimidazole, whereas a number of other cyclisation reagents were ineffective.
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