Enantioselective Synthesis of 2-Substituted 2-Phenylethylamines by Lithiation−Substitution Sequences: Synthetic Development and Mechanistic Pathway
作者:Jason M. Laumer、Dwight D. Kim、Peter Beak
DOI:10.1021/jo0258251
日期:2002.9.1
The lithiation and asymmetric substitution of N-(2-phenylethyl)isobutyramide (2) with selected electrophiles, under the influence of (-)-sparteine, provides benzylically substituted products in 58-90% yields with enantiomeric ratios (ers) from 72:28 to 91:9. Syntheses of enantioenriched dihydroisoquinolines (S)-18 and (S)-19 and a tetrahydroisoquinoline (4S)-20 provide examples of synthetic applications