Synthesis and olfactory evaluation of allylic α-quaternary thioether ketones

Abstract

Novel α-quaternary allylic thioether ketones were efficiently prepared from readily available α,β-unsaturated ketones in an easily scalable two-step procedure, with an acid-catalysed skeletal rearrangement of 2-(vinylthio) allylic alcohols as the key step. The sensory properties of this novel class of sulfur odorants were evaluated and all displayed green herbal and vegetal notes. An unexpected and interesting fresh patchouli note was observed for an alcohol derivative.