Synthesis of α-Aryl Esters and Nitriles: Deaminative Coupling of α-Aminoesters and α-Aminoacetonitriles with Arylboronic Acids
作者:Guojiao Wu、Yifan Deng、Chaoqiang Wu、Yan Zhang、Jianbo Wang
DOI:10.1002/anie.201406765
日期:2014.9.22
Transition‐metal‐free synthesis of α‐arylesters and nitriles using arylboronicacids with α‐aminoesters and α‐aminoacetonitriles, respectively, as the starting materials has been developed. The reaction represents a rare case of converting C(sp3)N bonds into C(sp3)C(sp2) bonds. The reaction conditions are mild, demonstrate good functional‐group tolerance, and can be scaled up.
The dicarbonylation of 1,3‐butadiene to adipic acid derivatives offers the potential for a more cost‐efficient and environmentally benign industrial process. However, the complex reaction network of regioisomeric carbonylation and isomerization pathways, make a selective and direct transformation particularly difficult. Here, we report surprising solvent effects on this palladium‐catalysed process
将1,3-丁二烯二羰基化为己二酸衍生物可为更具成本效益和环境友好的工业生产提供潜力。然而,区域异构体羰基化和异构化途径的复杂反应网络使得选择性和直接转化特别困难。在这里,我们报道了在存在1,2-双-二叔丁基膦膦-二甲苯(d t bpx)配体的情况下,钯催化的这一过程产生了令人惊讶的溶剂影响,这些配体允许由1,3-丁二烯,碳形成己二酸酯二酯。一氧化碳和甲醇,在可扩展条件下具有97%的选择性和100%的原子经济性。在最佳条件下,可以以高至极好的收率获得各种1,2-和1,3-二烯的二酯和三酯。
Chain propagation determines the chemo- and regioselectivity of alkyl radical additions to C–O <i>vs.</i> C–C double bonds
作者:Tiffany O. Paulisch、Felix Strieth-Kalthoff、Christian Henkel、Lena Pitzer、Dirk M. Guldi、Frank Glorius
DOI:10.1039/c9sc04846d
日期:——
Investigations into the selectivity of intermolecular alkyl radical additions to C–O- vs. C–C-double bonds in α,β-unsaturated carbonyl compounds are described. Therefore, a photoredox-initiatedradical chain reaction is explored, where the activation of the carbonyl-group through an in situ generated Lewis acid – originating from the substrate – enables the formation of either C–O or the C–C-addition
PROCESS FOR DOUBLE CARBONYLATION OF ALLYL ALCOHOLS TO CORRESPONDING DIESTERS
申请人:EVONIK DEGUSSA GMBH
公开号:US20170174610A1
公开(公告)日:2017-06-22
The invention relates to a process for doubly carbonylating allyl alcohols to the corresponding diesters, wherein a linear or branched allyl alcohol is reacted with a linear or branched alkanol (alcohol) with supply of CO and in the presence of a catalytic system composed of a palladium complex and at least one organic phosphorus ligand and in the presence of a hydrogen halide selected from HCl, HBr and HI.
PROCESS FOR DOUBLE CARBONYLATION OF ALLYL ETHERS TO CORRESPONDING DIESTERS
申请人:EVONIK DEGUSSA GMBH
公开号:US20170174609A1
公开(公告)日:2017-06-22
The invention relates to a process for doubly carbonylating allyl ethers to the corresponding diesters, wherein a linear or branched allyl ether is reacted with a linear or branched alkanol (alcohol) with supply of CO and in the presence of a catalytic system composed of a palladium complex and at least one organic phosphorus ligand and in the presence of a hydrogen halide selected from HCl, HBr and HI.