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
描述了在高度不对称诱导下(胺含量为83-95%)在胺部分内具有手性信息的锂化磺酰胺的第一个不对称α-烷基化反应。无外消旋的酸性水解产生标题化合物11,其总收率可接受且具有高对映体纯度(ee 91-≥98%;方案2)。作为新型的手性助剂,使用经典的Erlenmeyer苯基丝氨酸合成方法(方案1)合成了伯胺(S,S)-或(R,R)-2。