A highly diastereoselective synthesis of chroman derivatives bearing spirocyclic N,O-acetals skeleton via a one-pot tandem reaction
作者:Yu Zhou、Kai-Da Zhou、Xiao-Ping Xu、Ya-Nan Zhu、Zhen Wu、Shun-Jun Ji
DOI:10.1016/j.tet.2014.10.073
日期:2014.12
A tandemreaction for the synthesis of chroman framework via a one-potreaction of phenol, paraformaldehyde, and 5-benzylimidazolidin-4-one mediated by p-nitrobenzoic acid is described. The chroman derivatives containing spirocyclic N,O-acetal skeleton can be obtained in moderate to good yields (up to 89%) with good to excellent diastereoselectivities (up to >20:1 dr).