The synthesis method of 2?ethyl?2?aryl?dihydroquinoline derivatives was studied. The synthesis is divided into three steps: the first step, the Suzuki cross?coupling of 2?bromoquinoline and phenylboronic acid; the second step, the exchange of halide lithium; the third step, the nucleophilic addition of the organolithium reagent to the α?position of 2?phenylquinoline to obtain a double?substituted dihydroquinoline derivative. The drug with dihydroquinoline structure was synthesized by this method, and the target product was analyzed by various characterization methods, and the structure of the target product was confirmed.

Chiral oxazolines are a type of important chiral heterocycles compound, which are not only present in many biologically active natural products and drug small molecules with physiological activity, but also in chiral cofactors and chiral ligands often used in chiral synthesis. Currently, the asymmetric synthesis of chiral oxazolines still relies on the condensation between chiral amino alcohols and carboxylic acid derivatives. However, due to the limited availability of chiral amino alcohols and the tedious synthetic route, the development of highly efficient and straightforward methods for chiral oxazolines synthesis via asymmetric catalysis is of significant synthetic value. In this paper, we have summarized the recent advances in the asymmetric catalytic synthesis of chiral oxazoline derivatives through transition metal catalysis and organocatalysis, including asymmetric Aldol reactions, asymmetric clizations and others.