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A more sustainable and highly practicable synthesis of aliphatic isocyanides

Waibel, K. A.; Nickisch, R.; Möhl, N.; Seim, R.; Meier, M. A. R.

Synthesis protocols to convert N-formamides into isocyanides using three different dehydration reagents (i.e. p-toluenesulfonyl chloride (p-TsCl), phosphoryl trichloride (POCl3) and the combination of triphenylphosphane (PPh3) and iodine) were investigated and optimized, while considering the principles of green chemistry. Comparison of the yield and the E-factors of the different synthesis procedures revealed that, in contrast to the typically applied POCl3 or phosgene derivatives, p-TsCl was the reagent of choice for non sterically demanding aliphatic mono- or di-N-formamides (yields up to 98% and lowest E-factor 6.45). Apart from a significantly reduced E-factor, p-TsCl is cheap, offers a simplified reaction protocol and work-up, and is less toxic compared to other dehydration reagents. Thus, this procedure offers easier and greener access to aliphatic isocyanide functionalities.

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Verlagsausgabe §
DOI: 10.5445/IR/1000117605
Veröffentlicht am 09.03.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Organische Chemie (IOC)
Institut für Biologische und Chemische Systeme (IBCS)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 1463-9262, 1463-9270
KITopen-ID: 1000117605
Erschienen in Green chemistry
Band 22
Heft 3
Seiten 933–941
Vorab online veröffentlicht am 16.01.2020
Nachgewiesen in Scopus
Web of Science
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