Mechanochemical Copper‐Catalyzed Asymmetric Michael‐Type Friedel–Crafts Alkylation of Indoles with Arylidene Malonates
作者:Plamena Staleva、José G. Hernández、Carsten Bolm
DOI:10.1002/chem.201901826
日期:2019.7.11
asymmetric Michael‐type Friedel–Crafts alkylation of indoles with arylidene malonates was developed. The reaction proceeds under ambient atmosphere using a chiral bis(oxazoline)copper catalyst in a mixer mill. Under these reaction conditions nineteen 3‐substituted indole derivatives were synthesized in good to excellent yields (up to 98 %), and with good enantioselectivities (up to 91:9 e.r.) after short milling
开发了机械化学形式的吲哚与丙二烯基丙二酸酯的不对称Michael型Friedel-Crafts烷基化反应。反应在环境气氛下使用手性双(恶唑啉)铜催化剂在混合机中进行。在这些反应条件下,经过短时间的研磨,合成了19种3取代的吲哚衍生物,收率好至极好(高达98%),对映选择性(高达91:9 er)。