Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06511-8107, United States.
J Org Chem. 2023 Jun 16;88(12):7815-7820. doi: 10.1021/acs.joc.2c02727. Epub 2023 Jan 27.
The atroposelective synthesis of -aryl 1,2,4-triazoles was developed. A cyclodehydration reaction was rendered asymmetric with the use of a chiral phosphoric acid catalyst to afford atropisomeric -aryl 1,2,4-triazoles in up to 91:9 er. Recrystallization of the isolated heterocycle further enriched the atropisomeric ratio of several analogs to 99:1 er or greater. A divergent and substrate-dependent reaction pathway yielding a different heterocyclic product is also disclosed.
手性膦酸催化的不对称环脱水反应实现了 -芳基 1,2,4-三唑的高对映选择性合成,产物的对映选择性高达 91:9。进一步对分离得到的杂环化合物进行重结晶,能够将几种类似物的对映体过量值提高至 99:1 或更高。此外,本文还揭示了一种具有发散性和底物依赖性的反应途径,可以得到不同的杂环产物。