Asymmetric Friedel-Crafts Alkylation of Indoles with Nitrodienes and 2-Propargyloxy-β-nitrostyrenes Catalyzed by Diphenylamine-Linked Bis(oxazoline)-Zn(OTf)2 Complexes
作者:Jiahuan Peng、Da-Ming Du
DOI:10.1002/ejoc.201200382
日期:2012.7
The catalytic asymmetric Friedel–Crafts reaction of indoles with nitrodienes and 2-propargyloxy-β-nitrostyrenes was systematically investigated with diphenylamine-linked bis(oxazoline)–Zn(OTf)2 complexes. Moderate to good enantioselectivities were obtained with both kinds of substrates (up to 89 % ee for nitrodienes and up to 93 % ee for β-nitrostyrene derivatives). Further transformation of the corresponding
吲哚与硝基二烯和2-炔丙氧基-β-硝基苯乙烯的催化不对称Friedel-Crafts反应用二苯胺连接的双(恶唑啉)-Zn(OTf)2配合物进行了系统研究。两种底物都获得了中等至良好的对映选择性(硝基二烯高达 89% ee,β-硝基苯乙烯衍生物高达 93% ee)。进一步用 2-炔丙氧基-β-硝基苯乙烯对吲哚的相应 Friedel-Crafts 烷基化产物进行转化,得到具有药物化学意义的手性异恶唑并苯并恶烷衍生物,并保留对映体纯度。