Two ways for the synthesis of binaphthyl were examined based on a chiral ligand-mediated asymmetric conjugate addition of 1-naphthyllithium to naththalene-2-carboxylic acid 2,6-di-t-butyl-4-methoxyphenyl esters. The one pot method by conjugate addition-elimination gave a relatively higher enantioselectivity than the two step synthesis based on addition and subsequent oxidative aromatization.
通过手性
配体介导的 1-
萘锂与
萘-2-
羧酸 2,6-二叔丁基-4-
甲氧基苯基酯的不对称共轭加成,研究了合成联
萘的两种方法。与基于加成和随后氧化芳香化的两步合成法相比,通过共轭加成-消除的一锅法具有更高的对映选择性。