无金属条件下以酰基膦酸酯为烷基自由基受体的分子间酰化反应

Intermolecular Acylation with Acylphosphonates as Alkyl Radical Receptor under Metal-Free Conditions

羰基作为有机化学中的中心官能团之一,可以通过多种途径合成,但是利用酰基膦酸酯为酰基供体进行的分子间的自由基反应还鲜有报道.分别研究了在热化学和光化学条件下,酰基膦酸酯作为自由基受体分别和烷基醛、汉斯酯及烷烃三种自由基供体之间的酰化反应.以烷基醛和烷烃作为自由基前体时,在微波加热以及氧化剂存在的条件下,分子间的酰化反应可以顺利进行;而以汉斯酯作为自由基前体时,在紫外光照射及室温条件下,即可以顺利发生分子间的酰化反应.

As one of the central functional groups in organic chemistry,carbonyl skeleton can be achieved by many ways,but the intermolecular radical reaction using acyl phosphonate as acyl donor is rarely reported.The acylation reaction between acyl phosphonate as a free radical acceptor and three free radical donors,alkyl aldehyde,Hans ester and alkane,was studied under thermochemical and photochemical conditions,respectively.When alkyl aldehydes and alkanes were used as radical precursors,the intermolecular acylation reaction could proceed smoothly under the conditions of microwave heating and the presence of oxidants.When Hantzsch esters were used as the radical precursors,the intermolecular acylation reaction could take place smoothly under UV irradiation at room temperature.