Phosphine oxides as efficient neutral coordinate-organocatalysts for stereoselective allylation of N-acylhydrazones
作者:Chikako Ogawa、Hideyuki Konishi、Masaharu Sugiura、Sh? Kobayashi
DOI:10.1039/b315037b
日期:——
Phosphine oxides were found to be efficient neutral coordinate-organocatalysts (NCOs) for the allylation of N-acylhydrazones. Among the phosphine oxides tested, a three carbon-tethered bisphosphine oxide (dppp dioxide) was found to be the most effective, and in the presence of dppp dioxide, less reactive aromatic and α,β-unsaturated N-acylhydrazones underwent allylation as well as diastereoselective crotylation. Furthermore, a polymer-supported phosphine oxide was also developed as an effective immobilized NCO.
研究发现,膦氧化物是 N-酰肼烯丙基化的高效中性配位有机催化剂(NCO)。在测试的膦氧化物中,发现三碳系双膦氧化物(dppp dioxide)最为有效,在 dppp dioxide 的存在下,反应性较低的芳香族和 α、β-不饱和 N-酰肼发生了烯丙基化以及非对映选择性的弯曲化。此外,还开发了一种聚合物支撑的氧化膦,作为一种有效的固定化 NCO。