efficient and general method for Pd-catalyzed dehydrogenative aromatization of dihydro-heteroatom compounds without external O2 and H2 is first described. The protocol firstly uses isoprene as a hydrogen acceptor. Various dihydro-heterocycles including dihydropyrimidinones, dihydropyrimidines and dihydropyridines can be dehydrogenated to produce the corresponding aromatic heterocyclic compounds.
首先描述了在没有外部O 2和H 2的情况下,Pd催化二氢杂原子化合物进行脱氢芳构化的有效方法。该方案首先使用
异戊二烯作为氢受体。包括二氢
嘧啶酮,二氢
嘧啶和
二氢吡啶在内的各种二氢杂环可被脱氢以产生相应的芳族
杂环化合物。