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7648964 
Journal Article 
INTRAMOLECULAR HETERO-DIELS-ALDER REACTION OF PROLINAL-DERIVED N-ARYLIMINES LEWIS ACID-DEPENDENT REVERSAL OF THE DIASTEREOSELECTIVITY 
Linkert, F; Laschat, S; , 
1994 
Synlett
ISSN: 0936-5214
EISSN: 1437-2096 
GEORG THIEME VERLAG 
STUTTGART 
1994 
125-126 
English 
Intramolecular Lewis acid-catalyzed hetero-Diels-Alder reaction of L-prolinal-derived N-arylimine 1 yielded diastereoselectively either the cis,cis-diazacyclopenta[a]anthracene derivative 2a or the trans,trans-isomer 2b, depending on the Lewis acid.