Department of Chemistry and Center for Chemical Methodology and Library Development (CMLD-BU), Life Sciences and Engineering Building, Boston University, 24 Cummington Street, Boston, Massachusetts 02215, USA.
Org Lett. 2011 Dec 2;13(23):6316-9. doi: 10.1021/ol2028702. Epub 2011 Nov 8.
Tartaric acid catalyzes the asymmetric addition of vinylboronates to N-acyl quinoliniums, affording highly enantioenriched dihydroquinolines. The catalyst serves to activate the boronate through a ligand-exchange reaction and generates the N-acyl quinolinium in situ from the stable quinoline-derived N,O-acetal.
酒石酸催化乙烯基硼酸酯对 N-酰基喹啉鎓的不对称加成反应,得到高度对映富集的二氢喹啉。催化剂通过配体交换反应激活硼酸酯,并从稳定的喹啉衍生的 N,O-缩醛原位生成 N-酰基喹啉鎓。