Synthesis of α-Methylene-γ-lactone Structure by Cyclization of ω-Formylallylsilane in Water
作者:Hiroki Fukushima、Daisuke Ikegami、Chiaki Kuroda、Kenichi Kobayashi
DOI:10.1248/cpb.c18-00077
日期:2018.5.1
acid-promoted intramolecular cyclization of functionalized allylsilanes was studied in water for the synthesis of α-methylene-γ-lactone compounds. ω-Formyl-β-(acetoxymethyl)allylsilane afforded carbocyclic compounds in good yields, while the cyclization product was not obtained from the corresponding β-ethoxycarbonyl derivative. It was found that (Z)-β-(acetoxymethyl)allylsilane predominantly afforded the
研究了表面活性剂型质子酸促进的功能化烯丙基硅烷的分子内环化反应,以合成α-亚甲基-γ-内酯化合物。ω-甲酰基-β-(乙酰氧基甲基)烯丙基硅烷以良好的收率提供了碳环化合物,而未从相应的β-乙氧基羰基衍生物获得环化产物。发现(Z)-β-(乙酰氧基甲基)烯丙基硅烷主要提供顺式产物,而(E)-β-(乙酰氧基甲基)烯丙基硅烷几乎以1:1的比例提供顺式和反式产物。环化反应的立体选择性几乎与质子酸在CH2Cl2中促进的反应相同,并且可以通过C(Si)-C(烯烃)键与羰基部分之间的相互作用来解释。将环化产物转化为α-亚甲基-γ-内酯化合物。