Enantioselective Organocatalytic Friedel–Crafts Alkylation Reaction of Indoles with 5-Hydroxyfuran-2(5<i>H</i>)-one: Access to Chiral γ-Lactones and γ-Lactams via a Ugi 4-Center 3-Component Reaction
作者:Emmanuel Riguet
DOI:10.1021/jo201184p
日期:2011.10.21
resource, was used as an electrophile in the Friedel–Crafts alkylation of indoles catalyzed by a diphenylprolinol silyl ether. Moderate catalyst loading was achieved because of the high reactivity of 5-hydroxyfuran-2(5H)-one 1 in this process. Reduction of the Friedel–Crafts adduct (FC adduct) afforded indoyl lactones in high yield and enantioselectivity. Moreover, the FC adduct was used as a chiral
5-Hydroxyfuran-2(5 H)-one 1(一种容易获得的可再生资源)被用作二苯丙脯醇甲硅烷基醚催化的吲哚的Friedel-Crafts烷基化反应的亲电试剂。由于5-羟基呋喃-2(5 H)-one 1在此过程中具有高反应活性,因此催化剂负载适中。弗里德尔-克拉夫特加合物(FC加合物)的还原得到高产率和对映选择性的吲哚基内酯。此外,FC加合物在面向多样性的合成中用作手性合成子,如其成功地参与4中心3组分Ugi反应(U-4C-3CR)以提供高手性五元内酰胺所示。产率和对映选择性。