Synthesis and diastereofacial selectivity in Diels-Alder reactions of halogenated 2-aza-1,3-dienes
摘要:
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.