Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 24, Pages 13647-13651Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202102222
Keywords
fluorination; iodine(III); organocatalysis; ring expansion; tetralin
Categories
Funding
- Deutsche Forschungsgemeinschaft [SFB 858]
- Projekt DEAL
- WWU Munster
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Saturated, fluorinated carbocycles are important modules for contemporary drug discovery, and the synthesis of novel trifluorinated tetralins has been achieved. The conformational behavior of this novel structural balance has been investigated through computational analysis and is consistent with stereoelectronic theory.
Saturated, fluorinated carbocycles are emerging as important modules for contemporary drug discovery. To expand the current portfolio, the synthesis of novel trifluorinated tetralins has been achieved. Fluorinated methyleneindanes serve as convenient precursors and undergo efficient difluorinative ring expansion with in situ generated p-TolIF(2) (>20 examples, up to >95 %). A range of diverse substituents are tolerated under standard catalysis conditions and this is interrogated by Hammett analysis. X-ray analysis indicates a preference for the CH-F bond to occupy a pseudo-axial orientation, consistent with stabilising sigma(C-H)->sigma(C-F)* interactions. The replacement of the symmetric [CH2-CH2] motif by [CF2-CHF] removes the conformational degeneracy intrinsic to the parent tetralin scaffold leading to a predictable half-chair. The conformational behavior of this novel structural balance has been investigated by computational analysis and is consistent with stereoelectronic theory.
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