Polystyrene or Magnetic Nanoparticles as Support in Enantioselective Organocatalysis? A Case Study in Friedel–Crafts Chemistry
作者:Sara Ranjbar、Paola Riente、Carles Rodríguez-Escrich、Jagjit Yadav、Kishore Ramineni、Miquel A. Pericàs
DOI:10.1021/acs.orglett.6b00462
日期:2016.4.1
successfully applied to the asymmetric Friedel–Crafts alkylation of indoles with α,β-unsaturated aldehydes. While both catalytic systems can be easily recovered and admit repeated recycling, the polystyrene-based catalyst shows higher stability and provides better stereoselectivities.
第一次描述了第二代MacMillan咪唑啉丁4 -one的异构化版本。通过铜催化的炔-叠氮化物环加成(CuAAC)反应,这种通用的有机催化剂已负载在1%DVB Merrifield树脂和Fe 3 O 4磁性纳米颗粒上。所得的催化材料已成功地用于吲哚与α,β-不饱和醛的不对称Friedel-Crafts烷基化反应。虽然两个催化体系都可以轻松回收并允许重复循环,但聚苯乙烯基催化剂显示出更高的稳定性并提供了更好的立体选择性。
Enantioselective Organocatalytic Indole Alkylations. Design of a New and Highly Effective Chiral Amine for Iminium Catalysis
作者:Joel F. Austin、David W. C. MacMillan
DOI:10.1021/ja017255c
日期:2002.2.1
"privileged" structure with representation in over 3000 natural isolates and 40 medicinal agents of diverse therapeutic action. A newstrategy for asymmetric access to this important pharmacaphore has been accomplished that involves the amine catalyzed alkylation of indoles with alpha,beta-unsaturated aldehydes. Central to these studies has been the design of a newchiral amine catalyst that exhibits