Sweets for Catalysis - Facile Optimisation of Carbohydrate-Based Bis(oxazoline) Ligands
作者:Tobias Minuth、Mustafa Irmak、Annika Groschner、Tobias Lehnert、Mike M. K. Boysen
DOI:10.1002/ejoc.200801035
日期:2009.3
A new type of carbohydrate-basedbis(oxazoline) ligands was prepared from inexpensive D-glucosamine and tested in asymmetric cyclopropanation reactions. For optimisation, modified ligands with 3-O substituents of varying size and electronic properties were prepared as well as a 3-OH unprotected and a perpivaloylated derivative. All new ligands were tested in asymmetric cyclopropanation, revealing a