Citation: Hao Yong-Jia, Yu Jin-Sheng, Zhou Ying, Wang Xin, Zhou Jian. Influence of C—F…H—X Interactions on Organic Reactions[J]. Acta Chimica Sinica, ;2018, 76(12): 925-939. doi: 10.6023/A18080360 shu

Influence of C—F…H—X Interactions on Organic Reactions

Hao Yong-Jia ^a ,
Yu Jin-Sheng ^b ,
Zhou Ying ^a ,
Wang Xin ^d ,
Zhou Jian ^b,a,c,,

a.
College of Pharmacy, Guiyang University of Chinese Medicine, Guiyang 550025
b.
Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, East China Normal University, Shanghai 200062
c.
State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, CAS, Shanghai 200032
d.
College of Chemistry, Sichuan University, Chengdu 610064

Corresponding author: Zhou Jian, jzhou@chem.ecnu.edu.cn
Received Date: 31 August 2018
Available Online: 18 December 2018
Fund Project: Project supported by the National Natural Science Foundation of China (Nos. 21472049, 81660576) and Guizhou engineering research center for the exploitation and utilization technology of medicine and food dual-use resources

Figures(17)

Although the debate on whether or not C―F bonds can function as H-bond acceptors lasted for tens of years, dating back to 1939 when Pauling pointed out in The Nature of the Chemical Bond that C-F bonds do not have significant power to act as proton acceptors in the formation of hydrogen bonds, more and more evidences support the existence of C―F…H―X interactions, and in particular, C―F…H―O and C―F…H―N interactions cannot be ignored.Because the sum of the van der Waals radii of hydrogen and fluorine atoms is reported to be around as 2.55 , C―F…H―X interactions may exist if the calculated distance of F…H is less than 2.50 . Strong C―F…H―X interactions may occur if the calculated distance is less than 2.30 and the F…H―X angle is greater than 120°.In 2011, we observed strong fluorine effects on the Strecker reaction of ketimines: while Schreiner's thiourea could catalyze the Strecker reaction of acetophenone derived ketimine using TMSCN, it was unable to mediate the corresponding reaction of analogy α-CF₃ or α-CF₂H ketimines. Theoretical calculations revealed that the C―F…H―N interactions between the C―F bond of fluorinated ketimines and thiourea played the key role. This is the first report on the influence of such subtle interactions on organic reactions. Since then, reports from our and other groups revealed various types of C―F…H―X interactions that may be present in the reaction course, to strongly influence the reactivity and selectivity. Although successful examples are still limited, these achievements have suggested that C―F…H―X interactions may exist between the substrate and the catalyst; the substrate and the solvent; different reaction partners, or engender in the transition state with the reaction intermediate. Importantly, known examples demonstrate it possible to harness C―F…H―X interactions to tune reactivity and/or selectivity, which are useful for new reaction development, as well as for the design of new catalysts. To provide reference and inspiration for researchers engaged in organic synthesis, especially the organic fluorine chemistry, we summarize in this review the recent advances in the study of the influences of C―F…H―X interactions on organic reactions.
- C―F…H―X interaction,
- organic reaction,
- reactivity,
- selectivity
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