Crystal structures of three 3-chloro-3-methyl-2,6-di-aryl-piperidin-4-ones

Area of Science:

• Organic Chemistry
• Crystallography
• Chemical Synthesis

Background:

• Piperidin-4-one scaffolds are prevalent in medicinal chemistry and organic synthesis.
• Understanding the structural nuances of substituted piperidin-4-ones is crucial for designing new molecules with specific properties.

Purpose of the Study:

• To synthesize and characterize three new chloro-methyl-piperidin-4-one compounds.
• To elucidate the crystal structures of these compounds using X-ray diffraction.
• To investigate the conformational preferences and intermolecular interactions within the crystal lattices.

Main Methods:

• Chemical synthesis of three target piperidin-4-one derivatives.
• Single-crystal X-ray diffraction for structural determination.
• Analysis of molecular conformations and intermolecular interactions (hydrogen bonding, C-H···π).

Main Results:

• Successful synthesis of 3-chloro-3-methyl-2,6-diphenylpiperidin-4-one, 3-chloro-3-methyl-2,6-di-p-tolylpiperidin-4-one, and 3-chloro-3-methyl-2,6-bis-(4-chlorophenyl)piperidin-4-one.
• Piperidine rings in all three compounds adopt a chair conformation.
• Dihedral angles between phenyl ring planes vary, indicating distinct spatial arrangements.
• Molecules form C(6) chains via N-H···O hydrogen bonds; C-H···π interactions are also present.

Conclusions:

• The chair conformation of the piperidine ring is a stable feature in these substituted derivatives.
• Intermolecular hydrogen bonding and C-H···π interactions play a significant role in the crystal packing of these compounds.
• The structural data provide valuable insights for future drug design and materials science applications involving piperidin-4-one cores.