Effect of Ligand Structure on the Asymmetric Cyclization of Achiral Olefinic Organolithiums
作者:Michael J. Mealy、Matthew R. Luderer、William F. Bailey、Michael Bech Sommer
DOI:10.1021/jo049477+
日期:2004.9.1
The ability of a large and chemically diverse set of 30 chiral ligands to effect asymmetric cyclization of 2-(N,N-diallylamino)phenyllithium (1), derived from N,N-diallyl-2-bromoaniline (2) by low-temperature lithium−bromine exchange, has been investigated in an attempt to elucidate the structural motifs required to provide high enantiofacial selectivity in the ring closure. Although none of the ligands
大量化学性质多样的30个手性配体通过低温影响N,N-二烯丙基-2-溴苯胺(2)衍生的2-(N,N-二烯丙基氨基)苯基锂(1)的不对称环化的能力研究了溴溴化锂的交换,以阐明在闭环中提供高对映面部选择性所需的结构基序。尽管在本研究中检查的任何配体均未提供比以前观察到的1环化显着更高的ee的1-allyl-3-methylindoline 在基准配体(-)-天冬氨酸的存在下,发现一些结构上与斯巴汀无关的配体以对映体形式存在,它们与(-)-天冬氨酸在该化学中的效用匹配。