Synlett 2019; 30(19): 2169-2172
DOI: 10.1055/s-0039-1690237
letter
© Georg Thieme Verlag Stuttgart · New York

Synthesis of Acetamides from Aryl Amines and Acetonitrile by Diazotization under Metal-Free Conditions

Yao-Fu Zeng
a   Institute of Pharmacy and Pharmacology, University of South China, Hengyang, 421001, P. R. of China   Email: zengyf@usc.edu.cn
b   School of Pharmaceutical Science, University of South China, Hengyang, 421001, P. R. of China
,
Yi-Na Li
a   Institute of Pharmacy and Pharmacology, University of South China, Hengyang, 421001, P. R. of China   Email: zengyf@usc.edu.cn
,
Na-Na Zhang
b   School of Pharmaceutical Science, University of South China, Hengyang, 421001, P. R. of China
,
Huan Kang
b   School of Pharmaceutical Science, University of South China, Hengyang, 421001, P. R. of China
,
Pan Duan
b   School of Pharmaceutical Science, University of South China, Hengyang, 421001, P. R. of China
,
Fang Xiao
a   Institute of Pharmacy and Pharmacology, University of South China, Hengyang, 421001, P. R. of China   Email: zengyf@usc.edu.cn
,
Yu Guo
a   Institute of Pharmacy and Pharmacology, University of South China, Hengyang, 421001, P. R. of China   Email: zengyf@usc.edu.cn
b   School of Pharmaceutical Science, University of South China, Hengyang, 421001, P. R. of China
,
Xianghao Wen
c   Affiliated Nanhua Hospital, University of South China, Hengyang, 421001, P. R. of China
› Author Affiliations
This research was supported by the "Double First-Class" Discipline Construction Foundation of the University of South China (2017SYL06), the Undergraduate Training Programs for Innovation and Entrepreneurship in Hunan Province (S201910555144), and the Foundation of Hunan Educational Committee (18C0476, 18C0467).
Further Information

Publication History

Received: 27 July 2019

Accepted after revision: 15 October 2019

Publication Date:
23 October 2019 (online)


Abstract

An efficient and metal-free coupling reaction has been developed that affords acetamides from the corresponding aryl amines and acetonitrile. This method tolerates a wide range of functional groups and is selective toward aryl amines. Preliminary mechanistic studies were conducted.

Supporting Information

 
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  • 16 Acetamides 2av; General Procedure To a stirred solution of the appropriate arylamine (1.0 mmol) in CH3CN (5.0 mL) were added t-BuONO (1.5 mmol, 1.5 equiv), TfOH (1.5 mmol, 1.5 equiv), and H2O (5.0 mmol, 5.0 equiv). The mixture was stirred under air at 60 °C for 24 h until the reaction was complete. The resulting mixture was purified by flash chromatography (silica gel, PE–EtOAc). N-(4-Tolyl)acetamide (2b) White solid; yield: 83%; 123.8 mg; mp 150–151 °C. 1H NMR (500 MHz, CDCl3): δ = 7.44 (br s, 1 H), 7.37 (d, J = 8.1 Hz, 2 H), 7.10 (d, J = 8.1 Hz, 2 H), 2.30 (s, 3 H), 2.14 (s, 3 H). 13C NMR (126 MHz, CDCl3): δ = 168.5, 135.4, 134.1, 129.6, 120.2, 24.6, 21.0. MS (ESI): m/z = 150 [M + H]+