Asymmetric induction by the (S)-1-phenylethyl group in intramolecular nitrile imine cycloadditions giving enantiopure 3,3a-dihydro-pyrazolo[1,5-a][1,4]benzodiazepine-4(6H)-ones
摘要:
Stereoselective intramolecular cycloadditions of homochiral nitrile imines 5 are described as a fruitful source of enantiopure 3,3a-dihydro-pyrazolo[1,5-a][1,4]benzodiazepine-4(6H)-ones 6 and 7. (C) 1999 Elsevier Science Ltd. All rights reserved.
Facile Synthesis of (S,S)‐1,2‐Diacylamides and (S,S)‐1,2‐Diamines with C2‐Symmetry
摘要:
A series of chiral vicinal tertiary diacylamides with C-2-symmetry was synthesized from (S)-alpha-phenylethylamine, different aromatic aldehydes, and oxalyl chloride. The diacylamides obtained were then reduced to afford chiral vicinal diamines with C-2-symmetry. We propose that the diacylamides existed in four stable conformational isomers in solution because of the dihedral angle between acylamide bonds.
Asymmetric induction by the (S)-1-phenylethyl group in intramolecular nitrile imine cycloadditions giving enantiopure 3,3a-dihydro-pyrazolo[1,5-a][1,4]benzodiazepine-4(6H)-ones
Stereoselective intramolecular cycloadditions of homochiral nitrile imines 5 are described as a fruitful source of enantiopure 3,3a-dihydro-pyrazolo[1,5-a][1,4]benzodiazepine-4(6H)-ones 6 and 7. (C) 1999 Elsevier Science Ltd. All rights reserved.
Facile Synthesis of (<i>S,S</i>)‐1,2‐Diacylamides and (<i>S,S</i>)‐1,2‐Diamines with <i>C</i> <sub>2</sub>‐Symmetry
A series of chiral vicinal tertiary diacylamides with C-2-symmetry was synthesized from (S)-alpha-phenylethylamine, different aromatic aldehydes, and oxalyl chloride. The diacylamides obtained were then reduced to afford chiral vicinal diamines with C-2-symmetry. We propose that the diacylamides existed in four stable conformational isomers in solution because of the dihedral angle between acylamide bonds.