SN2′ addition/1,2-elimination of dimethylsulfonium methylide with epoxy vinyl sulfones: synthesis of exocyclic cross-conjugated dienyl sulfones
作者:Vikas Sikervar、Philip L. Fuchs
DOI:10.1039/c0cc05405d
日期:——
Dimethylsulfoniummethylide undergoes S(N)2' addition/1,2-elimination with epoxy vinylsulfones to generate enantiopure six and seven membered cross-conjugated hydroxy vinylsulfones. Moderate to excellent yields were obtained for both six and seven membered substrates.
The invention provides novel six and seven-carbon termini-differentiated polypropionate stereotetrads and stereopentads useful in syntheses of natural products. The invention also provides a novel alkylative sulfenylation-desulfonylation process that efficiently transforms enantiopure epoxyvinyl sulfones to syn and anti dienylsulfides in two operations.
Synthesis of Termini-Differentiated 6-Carbon Stereotetrads: An Alkylative Oxidation Strategy for Preparation of the C21−C26 Segment of Apoptolidin<sup>1</sup>
作者:Yuzhong Chen、Jerry B. Evarts、Eduardo Torres、Philip L. Fuchs
DOI:10.1021/ol026377m
日期:2002.10.1
an enantiospecific catalytic Jacobsen epoxidation of 1a and is five operations shorter. The second sequence features an oxygen-directed alkylativeoxidation reaction that re-establishes the dienyl sulfonefunctionality with concomitant 1,3-transposition of the sulfone moiety.