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.
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.
Highly stereoselective Friedel–Crafts type cyclization. Facile access to enantiopure 1,4-dihydro-4-phenyl isoquinolinones
stereoselective synthesis of 1,4-dihydro-4-phenyl isoquinolinones 5 based on a stereoselective Friedel–Crafts type cyclization. Cyclization precursors 1 were prepared in two steps, from the readily available (S)-mandelic acid, in 60–80% overall yield. The stereoselective electrophilic cyclization was accomplished in 20–86% yield and with 20–97% ee. In the course of this work, the presence of the amide