Tandem Ir-Catalyzed Allylic Substitution Reaction of Allyl Sulfinates and Isomerization
摘要:
An efficient method for the synthesis of trisubstituted vinyl sulfones is reported. Using the [Ir(COD)Cl](2)/phosphoramidite ligand (L-1)/DBU, trisubstituted vinyl sulfones could be synthesized from allyl sulfinates in high yields as exclusively E isomers.
Tandem Ir-Catalyzed Allylic Substitution Reaction of Allyl Sulfinates and Isomerization
摘要:
An efficient method for the synthesis of trisubstituted vinyl sulfones is reported. Using the [Ir(COD)Cl](2)/phosphoramidite ligand (L-1)/DBU, trisubstituted vinyl sulfones could be synthesized from allyl sulfinates in high yields as exclusively E isomers.
ASYMMETRIC INDUCTION IN THE PALLADIUM-CATALYZED SULFONYLATION OF ALLYLIC SULFINATES AND ACETATES WITH CHIRAL PHOSPHINE LIGANDS
作者:Kunio Hiroi、Kunitaka Makino
DOI:10.1246/cl.1986.617
日期:1986.4.5
Treatment of allylic (±)-p-toluenesulfinates with tetrakis(triphenylphosphine)palladium in the presence of chiral phosphine ligands underwent allylic sulfinate-sulfone rearrangements to give the corresponding optically active allylic sulfones in high optical yields. The palladium-catalyzed reactions of readily obtainable allylic acetates with sodium p-toluenesulfinate in the presence of chiral phosphine ligands provided a new entry to optically active allylic sulfones with high enantiomeric excess.
Dramatic solvent effects and stereospecificity in allylic sulphinate–sulphone rearrangements
作者:Kunio Hiroi、Ryuichi Kitayama、Shuko Sato
DOI:10.1039/c39830001470
日期:——
Dramaticsolventeffects were observed in the thermolysis of allyl sulphinates; heating of chiral trans- and cis-allyl sulphinates (S)-(–)-(1a–g) in N,N-dimethylformamide at 90–120 °C provided chiral sulphones (2a–d) in good yields with very high stereospecificity.
Palladium-catalysed allylic sulphinate–sulphone rearrangements; asymmetric induction in the palladium-catalysed transfer of chiral sulphinates to sulphones
作者:Kunio Hiroi、Ryuichi Kitayama、Shuko Sato
DOI:10.1039/c39840000303
日期:——
The rearrangement of allylicsulphinates to sulphones is facilitated by palladium catalysis, treatment of the chiral trans-and cis-allyl sulphinates (S)-(–)-(1a)-(1c), and -(1e), and(S)-(–)-(1b)and -(1d)with a catalytic amount of the palladium catalysts (3)and(5)providing the corresponding chiral allyl sulphones,(S)-(+)-and(R)-(–)-(2a–c), respectively, in good yields; exceptionally the palladium catalysis