A general gamma-C(sp(2))-H iodination method directed by an aliphatic keto group has been developed under transition-metal-free conditions for the first time, generating iodoarenes in good to excellent yields with excellent site selectivity. This protocol features a wide range of aryl-substituted ketones, short reaction times, mild reaction conditions, and scalable synthetic procedures. A possible reaction mechanism was also proposed based on several control experiments.
Synthesis of Benzo[<i>b</i>]furans by Intramolecular C–O Bond Formation Using Iron and Copper Catalysis
作者:Martyn C. Henry、Andrew Sutherland
DOI:10.1021/acs.orglett.0c00754
日期:2020.4.3
synthesis of benzo[b]furansfrom 1-aryl- or 1-alkylketones using nonprecious transition metal catalysts have been developed. Regioselective iron(III)-catalyzed halogenation of the aryl ring, followed by iron- or copper-catalyzed O-arylation allowed the synthesis of various structural analogues, including the benzo[b]furan-derived natural products corsifuran C, moracin F, and caleprunin B.
已经开发出使用非贵金属过渡金属催化剂从1-芳基酮或1-烷基酮合成苯并[ b ]呋喃的一锅法。区域选择性铁(III)催化的芳环卤化,然后是铁或铜催化的O-芳基化,可以合成各种结构类似物,包括苯并[ b ]呋喃衍生的天然产物corsifuran C、moracin F和卡普鲁宁 B.
The organocatalytic enantiodivergent fluorination of β-ketodiaryl-phosphine oxides for the construction of carbon-fluorine quaternary stereocenters
We developed, for the first time, the cinchona-alkaloid-catalyzed enantiodivergent α-fluorination of β-keto diarylphosphine oxides, which resulted in two enantiomers bearing fluorine-containing quaternary stereocenters.