Enantiospecific Synthesis of <i>N</i>-(9-Phenylfluoren-9-yl)-α-amino Ketones
作者:M. Rita Paleo、M. Isabel Calaza、F. Javier Sardina
DOI:10.1021/jo9707646
日期:1997.10.1
Enantiomerically pure N-(9-phenylfluoren-9-yl)-alpha-amino ketones were prepared in excellent yields by acylation of organolithium reagents with N-(9-phenylfluoren-9-yl)-alpha-amino acid-derived oxazolidinones. The method is not applicable for the acylation of Grignard reagents as they attack the methylenic carbon of the oxazolidinone to give the corresponding N-alkylated amino acids 13 in excellent yields. The resulting N-(9-phenylfluoren-9-yl)-alpha-amino ketones 8 could be stereoselectively reduced to the corresponding syn- or anti-beta-amino alcohols depending upon the nature of the reducing agent.
Enantiospecific synthesis of α-amino ketones and β-amino alcohols from the reaction of N-(9-phenylfluoren-9-yl)-alanine oxazolidinone with organolithium reagents
作者:M.Rita Paleo、F.Javier Sardina
DOI:10.1016/0040-4039(96)00557-6
日期:1996.5
Enantiomerically pure N-(9-phenylfluoren-9-yl) α-aminoketones were prepared by reaction of the N-Pf-alanine-derived oxazolidinone with organolithiumreagents. α-Aminoketones thus obtained could be stereoselectively reduced to the corresponding syn or anti β-aminoalcohols depending upon the nature of the reducing agent.