Control of Enantioselectivity in Rhodium(I) Catalysis by Planar Chiral Dibenzo[<i>a</i>
,<i>e</i>
]cyclooctatetraenes
作者:Michaela-Christina Melcher、Trpimir Ivšić、Charlotte Olagnon、Christina Tenten、Arne Lützen、Daniel Strand
DOI:10.1002/chem.201704816
日期:2018.2.16
Planar chiral 5,11‐disubstiuted dibenzo[a,e]cyclo‐octatetraenes (dbCOTs) have been developed as the first useful chiral homologs to dbCOT‐ligands for asymmetric applications. Methods enabling the preparation of such compounds on a gram‐scale in enantiomerically pure form are described. Evaluated as ligands in rhodium(I)‐catalyzed 1,4‐ and 1,2‐arylation reactions, tertiary and quarternary stereogenic
平面手性5,11-二取代的二苯并[ a,e ]环辛酸酯(dbCOT)已被开发为dbCOT-配体的第一个有用的手性同系物,用于不对称应用。描述了能够以克级对映体纯形式制备此类化合物的方法。在铑(I)催化的1,4和1,2芳基化反应中被评估为配体,形成了叔和四元立体异构中心,产率高,选择性高达ee > 99% 。(-)-penifulvin A的关键环化前体的催化不对称合成突出了该系统的应用背景。