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.
Stereoselective nitrilimine cycloadditions to the CN bond of enantiopure N-(1-phenylethyl)-1-arylmethanimines
作者:Giorgio Molteni、Alessandro Ponti
DOI:10.1016/j.tetasy.2004.10.028
日期:2004.11
Diastereoselective 1,3-dipolar cycloadditions between C-methoxycarbonyl-N-arylnitrilimines 2 and the C=N bond of enantiopure N-(1-phenylethyl)-1-arylmethanimines 3 gave diastereoisomeric 5-aryl-4,5-dihydro- 1,2,4-triazolines 4 and 5. A computational description of the E --> Z isomerisation of the C=N bond of unsubstituted 3a is given. (C) 2004 Elsevier Ltd. All rights reserved.