Chinese Journal of Organic Chemistry ›› 2023, Vol. 43 ›› Issue (3): 1124-1135.DOI: 10.6023/cjoc202211038 Previous Articles     Next Articles

Special Issue: 中国女科学家专辑

ARTICLES

含吡咯基配体的锌、锂和镁配合物的合成与表征及其对芳基碘代物的硼化反应和醛、酮的硼氢化反应的催化作用

党燕, 贾朝红, 王亚兰, 王丽, 李亚飞, 李亚红*()   

  1. 苏州大学材料与化学化工学部 江苏苏州 215123
  • 收稿日期:2022-11-29 修回日期:2023-01-04 发布日期:2023-02-06
  • 通讯作者: 李亚红
  • 基金资助:
    国家自然科学基金(21772140); 国家自然科学基金(22171198); 江苏省高等学校优势学科建设和苏州市基础科技(SZS201905)

Synthesis and Characterization of Zinc, Lithium and Magnesium Complexes Containing Pyrrolyl Ligands, and Utilization as Catalysts in Borylation of Aryl Iodides and Hydroboration of Aldehydes and Ketones

Yan Dang, Chaohong Jia, Yalan Wang, Li Wang, Yafei Li, Yahong Li()   

  1. College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123
  • Received:2022-11-29 Revised:2023-01-04 Published:2023-02-06
  • Contact: Yahong Li
  • Supported by:
    National Natural Science Foundation of China(21772140); National Natural Science Foundation of China(22171198); Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institution, and the Project of Scientific and Technologic Infrastructure of Suzhou(SZS201905)

The reactions of ZnEt2 with two pyrrolyl ligands 2-(2-((((1H-pyrrol-2-yl)methylene)amino)methyl)-1H-pyrrol-1- yl)-N,N-dimethylethan-1-amine (HL1) and N-((1H-pyrrol-2-yl)methyl)-1-(1H-pyrrol-2-yl)methanimine (H2L2) generated a zinc ethyl compound [Zn(L1)Et] (1) and a dinuclear complex [Zn2(L2)2(THF)2] (2). The complexes were characterized by 1H NMR, 13C NMR, elemental analysis, and single-crystal X-ray diffraction. Complexes 1 and 2 were employed as catalysts for the borylation of aryl iodides with B2Pin2 (B2Pin2=4,4,4',4',5,5,5',5'-octamethyl-2,2'-bis(1,3,2-dioxaborolane)). They were both active for this coupling reaction. Complex 1 displays higher activity than that of 2. This borylation transformation promoted by 1 features mild condition, wide substrate scope and high functional group compatibility. Moreover, the catalytic activities of two known compounds previously reported by our group, namely, [Li2(L1)2] (3) and [Mg(L1)2(THF)2] (4), toward borylation of aryl iodides with B2Pin2 were also explored. They cannot catalyze this coupling reaction. Nevertheless, complexes 3 and 4 were catalytically active toward hydroboration of aldehydes and ketones by pinacolborane (HBpin), giving a variety of borate esters in excellent yields in a very short time.

Key words: borylation, hydroboration, zinc complexes, catalysis