Abstract

The synthesis of mono- and trihalogenated derivatives of 2-aza 1,3-dienes 2 and 3 is described. The first example of diastereofacial selectivity in Diels-Alder reactions of heterodienes of type 2 with electron-poor dienophiles is reported, and a model for the explanation of the observed epimeric ratios, based on the interactions between diene and dienophile, is proposed

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