Diazoaldehyde Chemistry. Part 1. Transdiazotization of Acylacetaldehydes in Neutral-to-Acidic Medium. A Direct Approach to the Synthesis of α-Diazo-β-oxoaldehydes
作者:Özkan Sezer、Olcay Anaç
DOI:10.1002/hlca.19940770819
日期:1994.12.14
non-deformylating transdiazotization of acylacetaldehydes was achieved: the reactions of 2-azido-l-ethylpyridinium tetrafluoroborate (4) with acylacetaldehydes 3 proceeded partially without deformylation to yield 16 new α-diazo-β-oxoaldehydes 1 along with diazomethyl ketones 2, especially in the presence of NaOAc (Scheme 1, Tables 1 and 2). The product distribution was substituent-dependent and could
首次实现了酰基乙醛的非脱甲酰化重氮化反应:2-叠氮基-1-乙基吡啶鎓四氟硼酸酯(4)与酰基乙醛3的反应部分进行而没有甲酰化,生成了16种新的α-重氮-β-乙醛1与重氮甲基酮2,特别是在存在NaOAc的情况下(方案1,表1和2)。产物分布是取代基依赖性的,并且可以定量相关。这种新的重氮化反应似乎是合成这些重氮氧醛的一种替代,直接且更通用的方法。α-氧代环链烷甲醛5仅给出痕量(如果有的话)的α-重氮环烷酮如图7所示,分离出重排产物6(方案2)。讨论了反应机理(方案4和5)。