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Regioselective Synthesis of Chiral Six- and Seven-Membered N-Heterocycles from N-Allyl Carbohydrate Nitrones: Tuning of Regioselectivity by N-Substitution
The intramolecular cycloaddition of N-allyl carbohydrate nitrones leads to enantiomerically pure six- and seven-membered nitrogen heterocycles and the regioselectivity of the cycloaddition was controlled by changing the substituent on the nitrogen atom of the N-allyl moiety.