Enantioselektive Synthese von ?-substituiertenN-Methyl-sulfonamiden. Vorl�ufige Mitteilung
作者:Dieter Enders、Christian R. Thomas、Gerhard Raabe、Jan Runsink
DOI:10.1002/hlca.19980810543
日期:——
The first asymmetric α-alkylations of lithiated sulfonamides bearing the chirality information within the amine moiety under high asymmetric inductions (de 83–95%) are described. Racemization-free acidic hydrolysis led to the title compounds 11 in acceptable overall yields and with high enantiomeric purity (ee 91− ≥ 98%; Scheme 2). As a novel chiral auxiliary, the primary amine (S,S)-or (R,R)-2 was