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Jang, Mingyeong ; Lim, Taeho ; Park, Byoung Yong , et al. JOC,2022,87(2):910-919. DOI: 10.1021/acs.joc.1c01431 PubMed ID: 34983185
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Abstract: In this study, we developed a metal-free and highly chemoselective method for the reduction of aromatic nitro compounds. This reduction was performed using tetrahydroxydiboron [B2(OH)4] as the reductant and 4,4'-bipyridine as the organocatalyst and could be completed within 5 min at room temperature. Under optimal conditions, nitroarenes with sensitive functional groups, such as vinyl, ethynyl, carbonyl, and halogen, were converted into the corresponding anilines with excellent selectivity while avoiding the undesirable reduction of the sensitive functional groups.
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CAS No. : | 619-50-1 | MDL No. : | MFCD00007350 |
Formula : | C8H7NO4 | Boiling Point : | No data available |
Linear Structure Formula : | - | InChI Key : | YOJAHJGBFDPSDI-UHFFFAOYSA-N |
M.W : | 181.15 | Pubchem ID : | 12083 |
Synonyms : |
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Signal Word: | Warning | Class: | |
Precautionary Statements: | P261-P280-P301+P312-P302+P352-P305+P351+P338 | UN#: | |
Hazard Statements: | H302-H315-H319-H335 | Packing Group: | |
GHS Pictogram: |
* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
95% | With formaldehyd; hydrogen; propionic acid;aluminum nickel; In methanol; water; | EXAMPLE 6 181 parts of 4-nitrobenzoic acid methyl ester are suspended in 475 parts of methanol and are hydrogenated at 60 C under 100 atmospheres hydrogen pressure, after addition of 225 parts of aqueous formaldehyde solution (40% strength by weight), 30 parts of propionic acid and 12 parts of Raney nickel. After 112 parts by volume of hydrogen have been taken up in the course of 6 hours, the mixture is separated from the catalyst. The solvent is then distilled off at the same time the decrease in volume is made up with water. 4-dimethylaminobenzoic acid methyl ester, which is insoluble in water, separates out as crystals on cooling. The end product is filtered off, washed with water and dried. 170 parts of 4-dimethylaminobenzoic acid methyl ester of melting point 95 to 98 C are obtained, corresponding to a yield of 95% of theory. |