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–carbonbondformation) and carboxylic acids (carbon–oxygen bondformation) 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。
An Efficient Method for the Preparation of Tertiary Esters by Palladium-Catalyzed Alkoxycarbonylation of Aryl Bromides
作者:Zhuo Xin、Thomas M. Gøgsig、Anders T. Lindhardt、Troels Skrydstrup
DOI:10.1021/ol203057w
日期:2012.1.6
The palladium-catalyzed alkoxycarbonylation of aryl bromides is described for the efficient preparation of tertiary esters. The protocol proved compatible with a wide variety of functionallzed (hetero)aromatic bromides, as well as several different sterically hindered tertiary alcohols, affording the alkoxycarbonylated products in high yields. Finally, the formation of aromatic trityl esters is discussed.
P-fluorobenzoyl chloride for characterization of active hydrogen functional groups by fluorine-19 nuclear magnetic resonance spectrometry
作者:M. P. Spratt、H. C. Dorn
DOI:10.1021/ac00276a014
日期:1984.10.1
Copper-catalyzed oxidative esterification of unactivated C(sp<sup>3</sup>)–H bonds with carboxylic acids via cross dehydrogenative coupling
作者:Jiadi Zhou、Can Jin、Xiaohan Li、Weike Su
DOI:10.1039/c4ra14586k
日期:——
An effective copper-catalyzed esterification of unactivated (non-benzylic and allylic) C(sp3)–Hbonds of hydrocarbons with Selectfluor as an oxidant has been developed. This reaction could provide a direct, new and useful strategy for the synthesis of esters and alkyl alcohols by ester hydrolysis.