Green oxidation of indoles using halide catalysis

被引:116
作者
Xu, Jun [1 ,2 ,3 ]
Liang, Lixin [2 ]
Zheng, Haohao [1 ]
Chi, Yonggui Robin [3 ]
Tong, Rongbiao [2 ]
机构
[1] Guizhou Univ Tradit Chinese Med, Coll Pharm, Guiyang, Guizhou, Peoples R China
[2] HKUST, Dept Chem, Kowloon, Clear Water Bay, Hong Kong, Peoples R China
[3] Nanyang Technol Univ, Sch Phys & Math Sci, Div Chem & Biol Chem, Singapore 637371, Singapore
基金
中国国家自然科学基金;
关键词
C-H; ALKALOIDS; OXINDOLE; REARRANGEMENT; CONVERSION; ROUTE; TRANSFORMATIONS; MITRAPHYLLINE; PHYSOSTIGMINE; DERIVATIVES;
D O I
10.1038/s41467-019-12768-4
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Oxidation of indoles is a fundamental organic transformation to deliver a variety of synthetically and pharmaceutically valuable nitrogen-containing compounds. Prior methods require the use of either organic oxidants (meta-chloroperoxybenzoic acid, N-bromosuccinimide, t-BuOCl) or stoichiometric toxic transition metals [Pb(OAc)(4), OsO4, CrO3], which produced oxidant-derived by-products that are harmful to human health, pollute the environment and entail immediate purification. A general catalysis protocol using safer oxidants (H2O2, oxone, O-2) is highly desirable. Herein, we report a unified, efficient halide catalysis for three oxidation reactions of indoles using oxone as the terminal oxidant, namely oxidative rearrangement of tetrahydro-beta-carbolines, indole oxidation to 2-oxindoles, and Witkop oxidation. This halide catalysis protocol represents a general, green oxidation method and is expected to be used widely due to several advantageous aspects including waste prevention, less hazardous chemical synthesis, and sustainable halide catalysis.
引用
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页数:11
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