The formal (4+1)-cyclization between in situ generated achiral carbonyl-stabilized ammonium ylides and vinylogous p-quinone methides can be carried out under operationally simple conditions, leading to two different double bond regioisomers depending on the used conditions. Besides these racemic approaches, also a first proof-of-concept for enantioselective versions of these reactions has been obtained.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6173290 | PMC |
| http://dx.doi.org/10.1055/s-0037-1610268 | DOI Listing |
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