Hydroalkylation of Unactivated Olefins via Visible-Light-Driven Dual Hydrogen Atom Transfer Catalysis
作者:Guangyue Lei、Meichen Xu、Rui Chang、Ignacio Funes-Ardoiz、Juntao Ye
DOI:10.1021/jacs.1c05852
日期:2021.7.28
hydroalkylation of olefins enabled by hydrogen atom transfer (HAT) catalysis represents a straightforward means to access C(sp3)-rich molecules from abundant feedstock chemicals without the need for prefunctionalization. While Giese-type hydroalkylation of activated olefins initiated by HAT of hydridic carbon–hydrogen bonds is well-precedented, hydroalkylation of unactivated olefins in a similar fashion
通过氢原子转移 (HAT) 催化实现的烯烃自由基加氢烷基化代表了一种直接获得 C( sp 3)-丰富的分子来自丰富的原料化学品,无需预官能化。虽然由氢化碳-氢键的 HAT 引发的活性烯烃的 Giese 型加氢烷基化是有先例的,但未活化烯烃以类似方式的加氢烷基化仍然难以捉摸,主要是由于缺乏克服固有极性不匹配的通用方法。设想。在这里,我们报告了使用可见光驱动的双 HAT 催化来实现这一目标,其中催化量的胺硼烷和原位生成的硫醇分别用作氢原子提取物和供体。该反应是完全原子经济的,具有广泛的范围。
Cu-Catalyzed Cross-Electrophilic Coupling of α-Diazoesters with <i>O</i>-Benzoyl Hydroxylamines for the Synthesis of Unnatural <i>N</i>-Alkyl α-Amino Acid Derivatives
We describe a Cu-catalyzed cross-electrophilic coupling reaction for synthesizing α-aminoacidderivatives from α-diazoesters with O-benzoyl hydroxylamines with Cu(OAc)2 as the catalyst and polymethylhydrosilane (PMHS) as the hydride reagent. Excellent functional group compatibilities were demonstrated. With ethyl 2-diazo-3-oxobutanoate as the precursor, a Cu-acetoacetate complex has been characterized
The present invention is directed to a method for purifying pyruvic acid compounds, which method comprises reacting a pyruvic acid compound of general formula (I):
wherein R1 is an optionally substituted lower alkyl group, a lower alkenyl group, a lower alkynyl group, a cycloalkyl group, an aryl group, or a heterocyclic group, and R2 is a lower alkyl group, with a bisulfite of general formula (II):
MHSO3 (II)
wherein M is NH4 or an alkali metal, to give a bisulfite adduct of the pyruvic acid compound and then decomposing the adduct with an acid. According to the present invention, pyruvic acid compounds can be purified by simple and easy procedures without using purification techniques such as distillation or column chromatography, and the above method is advantageous as a process for the production on an industrial scale.
本发明涉及一种纯化丙酮酸化合物的方法,该方法包括使通式(I)的丙酮酸化合物反应:
其中 R1 是任选取代的低级烷基、低级烯基、低级炔基、环烷基、芳基或杂环基,R2 是低级烷基,与通式(II)的亚硫酸氢盐反应:
MHSO3 (II)
其中 M 为 NH4 或碱金属,以得到丙酮酸化合物的亚硫酸氢盐加合物,然后用酸分解该加合物。根据本发明,丙酮酸化合物可以通过简单易行的程序进行纯化,而无需使用蒸馏或柱层析等纯化技术,上述方法作为一种工业规模的生产工艺是非常有利的。