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DOI: 10.1055/s-0037-1612303
Synthesis of Isothiocyanates: An Update
NIH/DHHS 1R01Al121364-01A1Publication History
Received: 10 December 2018
Accepted after revision: 28 January 2019
Publication Date:
14 March 2019 (online)
Abstract
Isothiocyanates (ICTs) are a group of molecules that can be used for many different purposes, they exhibit anticancer, antimicrobial, antibiotic, and anti-inflammatory properties. The synthesis of isothiocyanates has been a focus of many researchers for nearly the past 100 years. One of the most common synthetic methods is to form a dithiocarbamate salt, either as the first step or in situ, and then treat the salt with a desulfurization agent to reach the isothiocyanate. There are many different desulfurization agents available. Among these, there are eleven in particular that will be discussed in this short review, namely thiophosgene, lead nitrate, ethyl chloroformate, hydrogen peroxide, triphosgene, iodine, cobalt, copper, sodium persulfate, claycop, and tosyl chloride. There are four additional particular methodologies that stand out from the literature available on this topic that will be covered, namely the production of isothiocyanates from hydroximoyl chlorides, via elemental sulfur, microwave-assisted synthesis, and through the tandem Staudinger/aza-Wittig reactions.
1 Introduction
1.1 Metabolism of Glucosinolates
2 Synthesis of Isothiocyanates
2.1 Isothiocyanates from the Decomposition of Dithiocarbamate Salts
2.2 Isothiocyanates from Hydroximoyl Chlorides
2.3 Isothiocyanates Produced via Elemental Sulfur
2.4 Microwave-Assisted Synthesis of Isothiocyanates
2.5 Isothiocyanates via the Tandem Staudinger/aza-Wittig Reactions
3 Conclusion
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