Abstract
Tandem aromatic rearrangements represent a potent strategy for modulating the regioselectivity
of a rearrangement process. In this article, we disclose two novel tandem aromatic
rearrangements triggered by sulfonium [5,5]-rearrangement recently developed in our
laboratory. Specifically, the [5,5]-rearrangement of aryl sulfoxides with allyl nitriles,
followed by [3,3]-Cope rearrangement, forges a seamless tandem [5,5]-/[3,3]-rearrangement
cascade, affording ortho-functionalized aryl sulfides. The other tandem process involves [5,5]-rearrangement
of aryl sulfoxides with allyl nitriles, followed by nucleophilic addition/DDQ-oxidation-induced
[3,3]-Cope rearrangement, eventually yielding meta-functionalized aryl sulfides. Both consecutive rearrangements enrich the repertoire
of tandem aromatic rearrangement methodologies.
Key words
aromatic Claisen rearrangement - [5,5]-rearrangement - tandem rearrangement - sulfur
- nitrile