Advances in the TBAF-induced aldol-type addition of α-trialkylsilyl-α-diazoacetones: TIPS versus TES
作者:Imen Abid、Sigrid Gavelle、Anne-Caroline Chany、Frédéric Legros、Pascal Gosselin、Souhir Abid、Gilles Dujardin、Catherine Gaulon-Nourry
DOI:10.1016/j.crci.2016.12.005
日期:2017.6
Résumé α-Triisopropylsilyl-α-diazoacetone (TIPS-diazoacetone) underwent high-yielding “diazo-side” Mukaiyama aldol-type addition with a range of aryl and alkyl aldehydes when subjected to stoichiometric amount of tetrabutylammonium fluoride at −16 °C, in Et2O. Robustness of the TIPS group makes TIPS-diazoacetone a stable surrogate for α-triethylsilyl-α-diazoacetone, on which generation of the corresponding carbanion can still be efficiently achieved under nucleophilic, weakly basic and practical conditions. These results highlight the synthetic potential that can be expected from TIPS-diazoacetone, promising building block for the convergent elaboration of highly functionalised versatile diazocarbonyl compounds.
摘要
α-三异丙基硅基-α-二氟乙酮(TIPS-diazoacetone)在-16°C下,使用等当量的四丁基氟铵和醚溶剂进行“二氟侧”Mukaiyama醇醛型加成,与多种芳基和烷基醛发生了高产率的反应。TIPS基团的稳健性使得TIPS-diazoacetone成为α-三乙基硅基-α-二氟乙酮的稳定替代物,相应的负离子在亲 nucleophilic、弱碱和实用条件下仍然可以高效产生。这些结果突显了TIPS-diazoacetone所期待的合成潜力,预示着它是合成高度功能化、多用途二氟羰基化合物的有前景的构建单元。