2-Methyl-6-nitrobenzoic anhydride

2-Methyl-6-nitrobenzoic anhydride is an organic acid anhydride also known as the Shiina reagent,[1][2] having a structure wherein carboxylic acids undergo intermolecular dehydration condensation. It was developed in 2002 by Prof. Isamu Shiina (Tokyo University of Science, Japan).[3] The compound is often abbreviated MNBA.

2-Methyl-6-nitrobenzoic anhydride
Names
IUPAC name
(2-Methyl-6-nitrobenzoyl) 2-methyl-6-nitrobenzoate
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.156.789
Properties
C16H12N2O7
Molar mass 344.279 g·mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Abstract

The reagent is used for synthetic reactions wherein medium- and large-sized lactones are formed from hydroxycarboxylic acids via intramolecular ring closure (Shiina macrolactonization).[4][5] The reaction proceeds at room temperature under basic or neutral conditions. This reagent can be used not only for macrolactonization but also for esterification, amidation, and peptide coupling.

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See also

References
  1. "Named Reagents". OChemOnline. Archived from the original on 2017-09-04.
  2. Yahata, K.; Ye, N.; Iso, K.; Naini, S. R.; Yamashita, S.; Ai, Y.; Kishi, Y. (2017). "Unified Synthesis of Right Halves of Halichondrins A–C". J. Org. Chem. 82 (17): 8792–8807. doi:10.1021/acs.joc.7b01283. PMID 28741352.
  3. Shiina, I.; Ibuka, R.; Kubota, M. (2002). "A New Condensation Reaction for the Synthesis of Carboxylic Esters from Nearly Equimolar Amounts of Carboxylic Acids and Alcohols Using 2-Methyl-6-nitrobenzoic Anhydride". Chem. Lett. 31 (3): 286. doi:10.1246/cl.2002.286.
  4. Shiina, I.; Kubota, M.; Oshiumi, H.; Hashizume, M. (2004). "An Effective Use of Benzoic Anhydride and Its Derivatives for the Synthesis of Carboxylic Esters and Lactones: A Powerful and Convenient Mixed Anhydride Method Promoted by Basic Catalysts". J. Org. Chem. 69 (6): 1822–30. doi:10.1021/jo030367x. PMID 15058924.
  5. Shiina, I. (2014). "An Adventurous Synthetic Journey with MNBA from Its Reaction Chemistry to the Total Synthesis of Natural Products". Bull. Chem. Soc. Jpn. 87 (2): 196–233. doi:10.1246/bcsj.20130216.


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