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Synthesis of both enantiomers of ferrocene[1,2-c]1H-quinolin-2-one by diastereoselective deproto-zincation of sugar-derived ferrocene esters†
Floris Chevallier,Thierry Roisnel,Palakodety Radha Krishna,Florence Mongin
RSC Advances Pub Date : 06/13/2012 00:00:00 , DOI:10.1039/C2RA21045B
Abstract

The diastereoselective deproto-metallation of several sugar-derived ferrocene esters using lithium-zinc bases was studied. While bis[(R)-1-phenylethyl]amino as the ligand afforded the diacetone-D-glucose-based (SP)-2-iodoferrocene ester in 91% de after iodination, the RP was synthesized from α-D-glucofuranose using 2,2,6,6-tetramethylpiperidino as the ligand. Both (RP)- and (SP)-ferrocene[1,2-c]1H-quinolin-2-one were reached by subsequent cyclizing couplings, albeit their racemization was noted.

Graphical abstract: Synthesis of both enantiomers of ferrocene[1,2-c]1H-quinolin-2-one by diastereoselective deproto-zincation of sugar-derived ferrocene esters
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