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.
Diastereoselective addition of methyllithium and dimethylcuprate-boron trifluoride to imines derived from (S)-1-phenylethylamine
作者:Giuseppe Alvaro、Diego Savoia、Maria R. Valentinetti
DOI:10.1016/0040-4020(96)00746-6
日期:1996.9
trifluoride reagents with the iminesderivedfrom (S)-1-phenylethylamine afforded the secondary amines by addition to the Si face of the imines. (S,S)-bis(1-phenylethyl)amine and (S)-1-cyclohexylethanamine were prepared with high stereoselectivity, in the latter case by a two step sequence involving the final cleavage of the auxiliary. Methyllithium attacked mainly the Si face of the iminesderivedfrom 4-pyridine