[3+2]-Anionic Electrocyclization Using 2,3-Bis(Phenylsulfonyl)-1,3-Butadiene: trans-4,7,7-Tricarbomethoxy-2-Phenylsulfonylbicyclo[3.3.0]Oct-1-Ene

[3+2]-Anionic electrocyclization using 2,3-bis(phenylsulfonyl)-1,3-butadiene: trans-4,7,7-Tricarbomethoxy-2-phenylsulfonylbicyclo[3.3.0]oct-1-ene intermediate: 2,3-bis(phenylsulfinyl)-1,3-butadiene reactant: 2,3-bis(phenylsulfonyl)-1,3-butadiene intermediate: dimethyl (E)-5-methoxycarbonyl-2-hexenedioate product: trans-4,7,7-tricarbomethoxy-2-phenylsulfonylbicyclo[3.3.0]oct-1-ene Keywords: alkylation, C-alkylation; alkylation, C-alkylation; cyclization, cycloaddition; oxidation, miscellaneous; rearrangements; dichloromethane (methylene chloride); triethylamine