Rhodium-Catalyzed Asymmetric Addition of Arylboronic Acids to Indolylnitroalkenes
作者:Junwei Xing、Guihua Chen、Peng Cao、Jian Liao
DOI:10.1002/ejoc.201101648
日期:2012.2
bioactive structures. Most approaches to access chiral indolylnitroethanes involve organocatalyzed or metal-catalyzed asymmetric FriedelCrafts reaction of indoles with nitroalkenes. We have developed an efficient approach to optically pure a-aryl-3-indolylnitroethanes through rhodium-catalyzed asymmetric 1,4-addition of arylboronic acids to indolylnitroalkenes. Excellent yields (up to 99?%) and enantiomeric
吲哚基硝基乙烷及其衍生物是许多生物活性结构的关键中间体。大多数获得手性吲哚基硝基乙烷的方法涉及吲哚与硝基烯烃的有机催化或金属催化的不对称弗里德尔克来福特反应。我们开发了一种有效的方法,通过铑催化的芳基硼酸与吲哚基硝基烯烃的不对称 1,4-加成来制备光学纯的 α-芳基-3-吲哚基硝基乙烷。在温和条件下,手性吲哚基硝基乙烷的产率高(高达 99?%)和对映体过量(高达 99?% ee)。