Cross-coupling reactions in Cinchona alkaloid chemistry: aryl-substituted and dimeric quinine, quinidine, as well as quincorine and quincoridine derivatives
作者:Jens Frackenpohl、Wilfried M. Braje、H. Martin R. Hoffmann
DOI:10.1039/b004693k
日期:——
Cross-coupling reactions of modified Cinchona alkaloids provide access to a wide variety of novel arylated and dimeric derivatives of quinine and quinidine containing a single and double 1,2-amino alcohol functionality. Sonogashira and Heck reactions allow functionalization of ethynyl and 11-iodovinyl precursors. The role of bystander functionality is investigated.
A novel methodology has been developed for the synthesis of chiral phosphoryl‐1,4‐dihydropyridazine derivatives based on an asymmetricallylicalkylation/intramolecular 1,3‐dipolar cycloaddition/rearrangement reaction sequence, various chiral 3‐phosphoryl‐4‐aryl‐1,4‐dihydropyridazine‐5‐carboxylates were achieved in high yields with high enantioselectivities. Moreover, chiral 4,5‐dihydropyridazinone