The reaction of dichlorocarbene with β-ethanolamines stereospecific synthesis of epoxides
作者:Luís Castedo、José L. Castro、Ricardo Riguera
DOI:10.1016/s0040-4039(01)91561-8
日期:——
Optically pure β-ethanolamines were converted into epoxides in good yield and with high e.e. ( ⩾, 95%) by reaction with dichlorocarbene. By this method α-aminoacids were successfully converted into synthetically useful epoxides.
The occurrence of p1,n1 salts can be exploited to sequester racemates; an application to technical mixtures of chrysanthemic acids (ChA) allowed the separation of trans- and cis-ChA and the recovery of the excess enantiomer of trans-ChA.
New chiral ligand for optically active β-hydroxy esters synthesis by enantioselective reformatsky reactions
作者:Dario Pini、Alberto Mastantuono、Piero StJvadori
DOI:10.1016/s0957-4166(00)86254-0
日期:1994.10
The cheap commercially available (1S,2S)-1-phenyl-2-amino-1,3-propanediol 2 appears to be a convenient precursor for the synthesis of chiral auxiliaries for the preparation of optically active β-hydroxy esters by asymmetric Reformatskyreactions. The N,N-dimethyl derivative of TBDMS-2 gave products with enantiomeric excesses up to 65 %.