Synthesis of dienes with 1,1-Captodative substitution
作者:N Stévenart-De Mesmaeker、R Merényi、H.G Viehe
DOI:10.1016/s0040-4039(00)96155-0
日期:1987.1
1,1-Captodative butadienes carrying amino, thioether or methoxy groups combined with nitrile and ester substituents were synthesized via a [3,2] sigmatropic rearrangement, an alkylation-halogenation-dehydrohalogenation sequence or via the Wittig-Horner reaction.
A ring-closingmetathesis strategy is reported for the construction of the 16-membered macrolactonecore of the bafilomycins. One decisive key feature is the presence of a 2,2-dimethoxyketal functionality at C-2 that provides the required flexibility to the tetraenicesterprecursor, allowing the ring-closingmetathesis reaction to take place. Three different modelesters of increasing complexity were