The reaction of primary nitroalkanes with conjugatedenones, in water and in the presence of K2CO3 as base, allows the synthesis of 2-acyl-4-nitrocyclohexanol derivatives in which the diastereoisomer (±)-(1S∗,2R∗,5R) is highly predominant. The reaction proceeds by double Michael addition of the nitroalkane to the enone, followed by intramolecular aldol reaction.
伯硝基烷烃与共轭烯酮在水中和在存在K 2 CO 3作为碱的条件下的反应,可以合成其中非对映异构体(±)-(1 S ∗,2 R ∗,5 R)非常重要。该反应通过将硝基烷烃双迈克尔加成至烯酮而进行,然后进行分子内羟醛反应。
Novel Catalysis in the Internal Nanocavity of Polyamine Dendrimer for Intramolecular Michael Reaction
Poly(propyleneimine) (PPI) dendrimers functionalized with C16 alkyl chains acted as efficient tertiary amine catalysts for an intramolecular Michael reaction. The substrate was accommodated in a reactive conformation within a sterically confined nanocavity consisting of regularly arranged tertiary amino groups of the PPI dendrimers.
用 C16 烷基链功能化的聚(丙烯酰亚胺)(PPI)树枝状聚合物是分子内迈克尔反应的高效叔胺催化剂。底物在由 PPI 树枝形分子中规则排列的叔氨基组成的立体封闭纳米空腔中呈反应构象。
Michael Type Additions with Nitroparaffins.<sup>1</sup> A Convenient Route to Nitrocyclohexanols