Ethoxide-Mediated Condensation of γ-tert-Butylallenoate and Aldehydes: Facile Stereoselective Synthesis of Conjugated Dienes and Enynes
作者:Zhengjie He、Silong Xu、Liyi Wang、Yuhai Tang
DOI:10.1055/s-0033-1341157
日期:——
selectivity. The condensation reaction of a γ-tert-butylallenoate, ethyl 5,5-dimethylhexa-2,3-dienoate, and aldehydes in the presence of sodium ethoxide is described. A range of aldehydes readily reacts with γ-tert-butylallenoate and ethoxide providing a straightforward synthesis of 1,2,3,4-tetrasubstituted conjugated dienes in moderate to good yields and exclusive E,E selectivity. For some aldehydes, the condensation
摘要 描述了在乙醇钠存在下γ-叔丁基烯丙酸酯,5,5-二甲基己二酸2,3-二烯丙基乙酯和醛的缩合反应。多种醛容易与γ-叔丁基烯丙酸酯和乙醇反应,从而以中等至良好的收率和独特的E,E选择性直接合成1,2,3,4-四取代的共轭二烯。对于某些醛,缩合反应可化学选择性地以高收率和独有的E选择性提供共轭烯炔。 描述了在乙醇钠存在下γ-叔丁基烯丙酸酯,5,5-二甲基己二酸2,3-二烯丙基乙酯和醛的缩合反应。多种醛容易与γ-叔丁基烯丙酸酯和乙醇反应,从而以中等至良好的收率和独特的E,E选择性直接合成1,2,3,4-四取代的共轭二烯。对于某些醛,缩合反应可化学选择性地以高收率和独有的E选择性提供共轭烯炔。