Stereoselective synthesis of all-<i>cis</i> boryl tetrahydroquinolines <i>via</i> copper-catalyzed regioselective addition/cyclization of <i>o</i>-aldiminyl cinnamate with B<sub>2</sub>Pin<sub>2</sub>
作者:Ya-Ping Bi、He-Min Wang、Hong-Yu Qu、Xian-Chen Liang、Ying Zhou、Xue-Ying Li、Defeng Xu、Mei-Hua Shen、Hua-Dong Xu
DOI:10.1039/c8ob03195a
日期:——
A copper catalyzed intramolecular 1,2-carboboration of o-aldiminyl cinnamate has been realized in both regio- and stereoselective fashions. This reaction provides a convenient entry to highly valuable and otherwise challenging cis-2,3,4-trisubstituted tetrahydroquinolines carrying a 4-boryl group. An unusual non-Michael addition intermediate or alternatively, a cyclic enolate is proposed to account
铜-邻二亚甲基肉桂酸酯的分子内1,2-碳羰基化已经以区域选择性和立体选择性两种方式实现。该反应为携带有价值的且具有挑战性的带有4-硼基的顺式-2,3,4-三取代的四氢喹啉提供了便利。提出了一种不寻常的非迈克尔加成中间体或环状烯醇化物,以解释最终产品中令人感兴趣的顺式构型。