Abstract
Reformatsky reagent prepared from methyl 1-bromocyclopentanecarboxylate and zinc reacted with 2-oxochromen-and 6-bromo-2-oxochromen-3-carboxylic acids N-arylamides yielding 3-aryl-1,1-tetramethylene-and 3-aryl-9-bromo-1,1-tetramethylene-2,3,4,4a,5,10b-hexahydro-1H-chromeno[3,4-c]pyridine-2,4,5-triones as single diastereomers.
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