A novel attractive interaction in the Diels–Alder reaction of N-protected pyrroles with allene-1,3-dicarboxylates
2001
Abstract The endo/exo selectivities of Diels–Alder reactions of N -protected pyrroles with allene-1,3-dicarboxylates were studied under Lewis acid assisted and thermal reaction conditions. A novel attractive effect between the N -protective carbonyl group of pyrrole and the ester group of allene-1,3-dicarboxylates operates to control the selectivity in the above Diels–Alder reaction. This new attractive effect to give the exo adduct is more effective than the Alder orbital effect.
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