An Acylative C–C Single-Bond Cleavage and a Self-Cyclization of Ethyl 2-(Trimethylsilylmethyl)penta-2,4-dienoate or Its Free Acid under Ritter Condition
作者:Chiaki Kuroda、Naoko Mitsumata、Chen Ying Tang
DOI:10.1246/bcsj.69.1409
日期:1996.5
An acylative C(3)–C(4)-bond cleavage of ethyl 4,5-disubstituted 2-(trimethylsilylmethyl)penta-2,4-dienoate occurred to give an ethyl 2-(2-oxoalkyl)acrylate by treatment with trifluoromethanesulfonic acid in nitriles. A self-cyclization also occurred to give a 5,5-disubstituted 3-methylenetetrahydrofuran-2-one when the reactions were carried out in bulky nitriles. Only self-cyclization proceeded when
4,5-二取代的 2-(三甲基甲硅烷基甲基)五-2,4-二烯酸乙酯的酰化 C(3)–C(4)-键裂解发生通过用三氟甲磺酸处理得到 2-(2-氧代烷基)丙烯酸乙酯腈中的酸。当反应在大分子腈中进行时,也会发生自环化反应,得到 5,5-二取代的 3-亚甲基四氢呋喃-2-one。当相应的 4,5-二取代 2-(三甲基甲硅烷基甲基)五-2,4-二烯酸在乙腈中处理时,仅发生自环化。描述了反应机理。