Studies on the reactivity of methyl γ-tosylcrotonoate as ambident reagent in organic synthesis
摘要:
The treatment of methyl O-4-tosyl-2-butenoate (4) with two equiv. of sodium hydride and different mono and dihalides gives mainly gamma,gamma- and alpha,alpha- or alpha,gamma- and alpha,alpha-dialkylated products (5-7) depending on the electrophile. The corresponding monoanion dimerizes with iodine to afford stereoselectively dimethyl cis-4,5-ditosyl-2,2,6-cyclohexadiene-1,2-dicarboxylate (11). The tosyl group in compounds 6 and 7 is reduced and in the case of gamma,gamma-dimethylated 5a substituted by sodium dimethyl malonate under Pd(PPh(3))(4) catalysis. Michael addition of different nucleophiles provides the corresponding beta-substituted methyl gamma-tosylbutanoates 16. Copyright (C) 1996 Elsevier Science Ltd
straightforward synthesis of isoindolinones has been developed via a [3 + 3] benzannulation of 4-arylmethylene-2,3-dioxopyrrolidines and 1,3-bissulfonylpropenes (or 4-sulfonylcrotonates). A series of functionalized isoindolinones were obtained in excellent yields. The reaction could be carried out under mild conditions without transition metal catalyst. The finding provides a practical approach for the