Use of 2,3-bis(phenylsulfonyl)-1-propene as a multicoupling reagent
摘要:
2,3-Bis(phenylsulfonyl)-1-propene (1) reacts with various amines to afford products derived from addition across the double bond as well as S(N)2' displacement. When treated with 2-piperidinemethanol, bissulfone 1 gave the expected S(N)2' product which was converted to the corresponding bromide and cyclized with tributyltin hydride to a bicyclic amine. Reaction of bissulfone 1 with furfurylamine followed by treatment with acetyl chloride afforded the product derived from a tandem S(N)2' displacement-intramolecular Diels-Alder reaction. Several novel heterocyclic compounds were prepared by connecting two nucleophilic sites with a carbon-carbon bond and allowing this reagent to react with bissulfone 1. The reaction of 1 with the pyrrolidine enamine derived from cyclohexanone gave bicyclo[3.3.1]nonan-9-one in 78% yield. The soft nucleophile approach is not the only way to add carbon centers to bissulfone 1. Radical attack on the double bond of 1 leads to an intermediate sulfonyl-stabilized radical. This species readily fragments to produce a new vinyl sulfone which undergoes further radical cyclization to give six-membered ring sulfones.
Cu2O-catalyzed C–S bond cross coupling of alkane-/arene-sulfinates and (enantioenriched) benzylic quaternaryammoniumsalts has been developed. The product benzylic sulfones were obtained in good to high yields (75–96%). Chiral arylmethyl sulfones with high enantiomeric excess (90–94% ee) were also synthesized in the presence of Cu2O and 1,1′-bis-(diphenylphosphino)ferrocene (dppf).
alkylation of sulfinicacids with sulfonamides has been developed via sp3 C−N bond cleavage at room temperature. In the absence of external catalysts and additives, a wide variety of N-benzylic and N-allylic sulfonamides couple with sulfinicacids to give structurally diversified sulfones in moderate to excellent yields. Furthermore, the reaction of N-(2-acyl)allylic sulfonamides with sulfinicacids provides
In the absence of external catalysts and additives, a broad range of benzylic and allylic alcohols react with various sulfinyl chlorides to afford structurally diversified benzylic and allylic sulfones in moderate to excellent yields, and importantly, a catalysis with byproduct HCl is involved in this new protocol for sulfone synthesis.