Author: ["Ana-Florina Voica","Abraham Mendoza","Will R. Gutekunst","Jorge Otero Fraga","Phil S. Baran"]
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Abstract
The excision of hydrogen from an aliphatic carbon chain to produce an isolated olefin (desaturation) without overoxidation is one of the most impressive and powerful biosynthetic transformations for which there are no simple and mild laboratory substitutes. The versatility of olefins and the range of reactions they undergo are unsurpassed in functional group space. Thus, the conversion of a relatively inert aliphatic system into its unsaturated counterpart could open new possibilities in retrosynthesis. In this article, the invention of a directing group to achieve such a transformation under mild, operationally simple, metal-free conditions is outlined. This ‘portable desaturase’ (TzoCl) is a bench-stable, commercial entity (Aldrich, catalogue number L510092) that is facile to install on alcohol and amine functionalities to ultimately effect remote desaturation, while leaving behind a synthetically useful tosyl group. A bench-stable, aryl sulfonyl triazene is described that can be appended to alcohols or amines and used as a directing group to effect remote desaturation of unactivated aliphatics to produce olefins. The reaction is mild, operationally simple, requires no added metals and produces unsaturated tosylates or tosylamides available for further functionalization.Cite this article
Voica, AF., Mendoza, A., Gutekunst, W. et al. Guided desaturation of unactivated aliphatics. Nature Chem 4, 629–635 (2012). https://doi.org/10.1038/nchem.1385 