Enantioselective Cu-catalyzed 1,4-addition of Me3Al to a 4,4-disubstituted cyclohexa-2,5-dienone
作者:Yoshiji Takemoto、Satoru Kuraoka、Naoko Hamaue、Keiichi Aoe、Hajime Hiramatsu、Chuzo Iwata
DOI:10.1016/0040-4020(96)00869-1
日期:1996.11
A series of chiral enantiomerically pure 2-aryloxazolines was synthesized. (4S)-2-(2′,6′-dimethoxyphenyl)-4-isopropyloxazoline proved to be an efficient chiral ligand for the Cu-catalyzed conjugate addition of Me3Al to cyclohexadienone, and by using 20mol% of this ligand, 1,4-adduct was obtained in 68% ee. In addition, TBDMSOTf is crucial for the asymmetric conjugate addition to proceed with good chemical
合成了一系列手性对映体纯的2-芳基恶唑啉。(4 S)-2-(2',6'-二甲氧基苯基)-4-异丙基恶唑啉被证明是将Me 3 Al铜催化共轭加成到环己二酮中的有效手性配体,通过使用20mol%的该配体,在68%ee中获得1,4-加合物。另外,TBDMSOTf对于不对称共轭物添加以良好的化学收率和高ee进行至关重要。