aminolysis reaction between various aryl esters and inert tertiaryamines by C–O and C–N bond activations has been developed for the selective synthesis of a broad scope of tertiary amides under neutral and mild conditions. The mechanism may undergo the two key steps of oxidativeaddition of acyl C–O bond in parent ester and C–N bond cleavage of tertiaryamine via an iminium-type intermediate.
Energy-Efficient Green Catalysis: Supported Gold Nanoparticle-Catalyzed Aminolysis of Esters with Inert Tertiary Amines by C–O and C–N Bond Activations
Catalyzed by supported gold nanoparticles, an aminolysis reaction between various aryl esters and inert tertiary amines by C–O and C–N bond activations has been developed for the selective synthesis of tertiary amides. Comparison studies indicated that the gold nanoparticles could perform energy-efficient green catalysis at room temperature, whereas Pd(OAc)2 could not.
A novel and efficient protocol for the synthesis of amides is reported which employs a BODIPY catalyzed oxidative amidation reaction between aromatic aldehydes and amines under visible light. Compared with the known Ru or Ir molecular catalysts and other organic dyes, the BODIPY catalyst showed higher reactivity toward this reaction. Mechanistic studies reveal that dioxygen could be activated through
SEM, TEM, energy‐dispersive X‐ray spectroscopy, and vibrating‐sample magnetometer techniques. Fe3O4/PDA/CdS was found to be a highly active photocatalyst for the amidation of aromatic aldehydes by using air as a clean oxidant under mild conditions. The photocatalyst can be recovered by magnetic separation and successfully reused for five cycles without considerable loss of its catalytic activity.
磁性CdS量子点(Fe 3 O 4 /聚多巴胺(PDA)/ CdS)通过廉价的起始原料通过便捷的方法合成。通过FTIR光谱,XRD,SEM,TEM,能量色散X射线光谱和振动样品磁力计技术对制得的催化剂进行表征。通过在温和条件下使用空气作为清洁氧化剂,发现Fe 3 O 4 / PDA / CdS是一种高活性的光催化剂,可用于芳族醛的酰胺化。可以通过磁分离回收光催化剂并成功地重复使用五个循环,而不会显着降低其催化活性。
Polycyclic Azetidines and Pyrrolidines via Palladium-Catalyzed Intramolecular Amination of Unactivated C(sp3)–H Bonds
A novel strategy to construct complex polycyclic nitrogen-containing heterocycles from aliphatic amines via picolinamide-assisted palladium-catalyzed C–H bond activation reaction was reported. The reaction exhibits broad substrate scope for the synthesis of various azabicyclic scaffolds, including azetidines and tropane-class alkaloids. Application of this method to naturally occurring (−)-cis-myrtanylamine
据报道,有一种新的策略可以通过吡啶甲酰胺辅助的钯催化的C–H键活化反应从脂肪族胺中构建复杂的多环含氮杂环。该反应显示出广泛的底物范围,可用于合成各种氮杂双环支架,包括氮杂环丁烷和托烷类生物碱。该方法在天然存在的(-)-顺式-二甲基乙胺中的应用,这是前所未有的碳-碳键活化,其中涉及的电子对引发了环钯片段的分子内“ S N 2样”置换。第三中心,描述。