Chiral Bifunctional Phosphine Ligand Enables Gold-Catalyzed Asymmetric Isomerization and Cyclization of Propargyl Sulfonamide into Chiral 3-Pyrroline
作者:Xinpeng Cheng、Liming Zhang
DOI:10.1021/acs.orglett.1c02896
日期:2021.11.5
This work details an asymmetric gold-ligand cooperative catalysis that transforms readily accessible chiral/achiral propargylic sulfonamides into chiral 3-pyrrolines. A bifunctional biphenyl-2-ylphosphine ligand featuring a chiral tetrahydroisoquinoline fragment is essential for the observed metal–ligand cooperation and the asymmetric induction. 2,5-cis-3-Pyrrolines are formed with excellent diastereoselectivities
这项工作详细介绍了一种不对称的金-配体协同催化,它将容易获得的手性/非手性炔丙基磺酰胺转化为手性 3-吡咯啉。具有手性四氢异喹啉片段的双功能联苯-2-基膦配体对于观察到的金属-配体合作和不对称诱导至关重要。在“匹配”情况下, 2,5- cis -3-Pyrrolines 以优异的非对映选择性形成。使用配体对映异构体的“错配”方案提供了具有 >5/1 非对映选择性的 2,5-反式-3-吡咯啉。证明了这种化学的合成效用。