Rhodium-catalyzed intramolecular hydroacylation of 1,2-disubstituted alkenes for the synthesis of 2-substituted indanones
作者:Jing Yuan、Chong Liu、Yan Chen、Zhenfeng Zhang、Deyue Yan、Wanbin Zhang
DOI:10.1016/j.tet.2018.11.057
日期:2019.1
The intramolecular hydroacylation of 1,2-disubstituted alkenes was considered to be a challenging task due to the side reactions resulted from the lack of additional substituent at 1-position and the low activity caused by the steric hindrance of substituent at 2-position, and an asymmetric version has not been considered possible due to problems associated with the racemization of the products. We
1,2-二取代烯烃的分子内加氢酰化被认为是一项艰巨的任务,这是由于在1位缺少额外的取代基以及在2位取代基的空间位阻引起的低活性导致的副反应,以及由于与产品消旋有关的问题,非对称版本尚未被认为是可行的。我们已经部分解决了这些问题。在活化的二膦-Rh配合物的催化下,在选定的二卤代溶剂中反应,邻-(2-芳基乙烯基)苯甲醛的分子内氢酰化反应可提供高产率的相应2-芳基-1-茚满酮,以及使用o的不对称变体-(2-烷基乙烯基)苯甲醛以高收率和中等对映选择性提供手性2-烷基-1-茚满酮。