Borane-Catalyzed C(sp<sup>3</sup>)–F Bond Arylation and Esterification Enabled by Transborylation
作者:Dominic R. Willcox、Gary S. Nichol、Stephen P. Thomas
DOI:10.1021/acscatal.1c00282
日期:2021.3.19
given the high thermodynamic barrier to C–F bond cleavage. Stoichiometric hydridoborane-mediated C–F functionalization has recently emerged, but is yet to be rendered catalytic. Herein, the borane-catalyzed coupling of alkyl fluorides with arenes (carbon–carbon bond formation) and carboxylic acids (carbon–oxygen bond formation) has been developed using transborylation reactions to achieve catalytic
鉴于氟碳键断裂的高热力学障碍,碳氟键的活化和功能化是一个重大的合成挑战。化学计量氢化硼硼烷介导的CF功能化最近出现,但尚未被催化。在本文中,已经开发出了硼烷催化的烷基氟与芳烃(形成碳-碳键)和羧酸(形成碳-氧键)的偶联反应,以实现催化转化。在各种结构上和电子分化芳烃和羧酸的使用9-硼杂双环[3.3.1]壬烷(H-达到成功的C-C和C-O耦合乙-9-BBN)作为催化剂和频哪醇硼烷(HBpin),具有宽泛的官能团耐受性。实验和计算研究表明碳-碳和碳-氧偶联反应的机理二分法。乙-F transborylation(B-F / B-H复分解)F-之间乙-9-BBN和HBpin启用碳-碳键形成的催化周转,而烷基氟化物和acyloxyboronic酯之间的直接交换(C-F / B -O复分解)被提议用于碳-氧偶联,其中H - B -9-BBN催化羧酸与HBpin的脱氢偶联。