Dedicated to Prof. Alain Krief on the occasion of his 80th birthday
Chiral hypervalent iodine reagents are active players in modern stereoselective organic
synthesis. Structurally diverse chiral hypervalent iodine reagents have been synthesised
and extensively studied, but hypervalent iodine reagents containing chiral sulfur
stereogenic centre are scarce and their synthesis is challenging. A small library
of iodoarenes containing chiral sulfinamide and chiral sulfoximine moieties has been
synthesised using commercially available reagents. The oxidation of the chiral iodoarene
precursors to iodine(III) reagents was cumbersome due to facile overoxidation of the
sulfoxide moiety and hence loss of chirality under various oxidation conditions. Oxidation
of chiral sulfonimidoyl derivatives to the corresponding hypervalent iodine reagents
was successful and led to novel sulfur-based chiral iodine(III) reagents.
Key words
hypervalent iodine - oxidation - stereoselective synthesis - sulfoximines - sulfur
derivatives