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All-Heteroatom-Substituted Carbon Spiro Stereocenters: Synthesis, Resolution, Enantiomeric Stability, and Absolute

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Summary
This summary is machine-generated.

Chiral tetra-heterosubstituted methanes were synthesized using CpRu catalysis. These compounds exhibit unique chiroptical properties and high enantiomerization barriers, with potential applications in stereoselective synthesis.

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Area of Science:

  • Organic Chemistry
  • Stereochemistry
  • Catalysis

Background:

  • Chiral tetra-heterosubstituted methanes are valuable building blocks in stereoselective synthesis.
  • Establishing absolute configurations and understanding enantiomerization barriers are crucial for their application.

Purpose of the Study:

  • To synthesize chiral tetra-heterosubstituted methanes (tetraoxa and azatrioxa carbon spiro stereocenters) via CpRu catalysis.
  • To characterize their chiroptical properties and determine absolute configurations.
  • To investigate their enantiomerization barriers and the underlying mechanisms.

Main Methods:

  • CpRu-catalyzed synthesis using cyclic carbonates/carbamates and α-diazo-β-ketoesters.
  • Chiral stationary phase chromatography for enantiomer isolation and characterization.
  • Time-dependent density functional theory (TD-DFT) and density functional theory (DFT) calculations for configuration assignment and mechanism elucidation.
  • Enantioselective dynamic chromatography for determining enantiomerization barriers.

Main Results:

  • Successful synthesis of chiral tetraoxa and azatrioxa carbon spiro stereocenters.
  • Observed chiroptical properties (g_abs ~10^-5 to 10^-4) aiding absolute configuration assignment.
  • Determination of significant enantiomerization barriers for ortho-carbonates (up to 27.6 kcal/mol) and ortho-carbamates (up to 34.6 kcal/mol).
  • DFT calculations revealed mechanistic insights into the differing C-O and C-N bond cleavage preferences.

Conclusions:

  • CpRu catalysis provides an effective route to chiral tetra-heterosubstituted methanes.
  • The synthesized compounds possess stable stereocenters with high enantiomerization barriers, especially ortho-carbamates.
  • Understanding the mechanistic basis for stability is key for designing novel chiral molecules.