Diastereoselective Synthesis of P‐Chirogenic and Atropisomeric 2,2′‐Bisphosphino‐1,1′‐binaphthyls Enabled by Internal Phosphine Oxide Directing Groups
作者:Qingquan Xue、Shangfei Huo、Tingyi Wang、Zeming Wang、Jianli Li、Meifang Zhu、Weiwei Zuo
DOI:10.1002/anie.202001561
日期:2020.5.18
Diphosphine ligands that merge both axial and P‐centered chirality may exhibit superior or unique properties. Herein we report the diastereoselective introduction of P‐centered chirality at the 2‐position of the axially chiral 2′‐(phosphine oxide)‐1,1′‐binaphthyl scaffold. A lithium–bromide exchange reaction of a 2‐bromo‐2′‐(phosphine oxide)‐1,1′‐binaphthyl and treatment with dichlorophosphines followed
兼具轴向和P中心手性的二膦配体可能表现出优异的或独特的性能。在此,我们报道了在轴向手性2'-(氧化膦)-1,1'-联萘骨架的2位上非中心选择性引入P-中心手性。2-溴2'-(氧化膦)-1,1'-联萘的溴化锂交换反应并用二氯膦处理,然后用亲核有机金属试剂处理,得到不对称的2-膦-2'-(氧化膦)-具有双萘基轴向手性的1,1'-萘基和一个或两个带有多个P取代基的磷立体中心。最终的非对映异构纯的2,2'-双膦基-1,1'-联萘基是通过氧化膦直接基团的还原而获得的。