Synthesis of planar chiral imidazo[1,5-a]pyridinium salts based on [2.2]paracyclophane for asymmetric β-borylation of enones
作者:Bing Hong、Yudao Ma、Lei Zhao、Wenzeng Duan、Fuyan He、Chun Song
DOI:10.1016/j.tetasy.2011.06.023
日期:2011.5
Novel planar chiral pseudo-geminal and pseudo-ortho-oxazoline substituted [2.2]paracyclophanyl imidazo[1,5-a]pyridinium triflates were synthesized. During the synthesis of a pseudo-ortho imidazo[1,5-a]pyridinium triflate based on [2.2]paracyclophane, the diastereoisomers of 4-amino-12-oxazolinyl[2.2]paracyclophane were separated. The imidazo[1,5-a]pyridinium triflates were used as carbene precursors
合成了新型的平面手性伪锗烷和伪邻恶唑啉取代的[2.2]对环吡啶基咪唑并[1,5- a ]吡啶鎓三氟甲磺酸酯。在基于[2.2]对环环烷的三氟甲磺酸假邻位咪唑并[1,5 - a ]吡啶鎓的合成过程中,分离了4-氨基-12-恶唑啉基[2.2]对环烷的非对映异构体。咪唑并[1,5- a ]吡啶三氟甲烷用作卡宾的前体在铜催化的烯酮的对映选择性共轭β-硼化反应中使用。在一系列配体和底物的初步测试中,我们获得了高达84%的对映选择性。