Herstellung von steroisomeren 3-Sulfinylbuttersäuren aus (<i>R</i>)- und (<i>S</i>)-4-Methyl-2-oxetanon
作者:Richard Breitschuh、Dieter Seebach
DOI:10.1055/s-1992-34181
日期:——
The β-lactone ((S) and (R)-4-methyl-2-oxetanone,1 , ent-1), readily available from (R)- and (S)-3-hydroxybutyric acid, is opened by sodium hydrosulfide, sodium alkane- and arenethiolates, respectively, with inversion of configuration. The resulting 3-(alkylthio)-2f, 2g, and 3-(arylthio)butyric acids, 2b-2e, ent-2h-2k (Table 1), oxidized with hydrogen peroxide in acetone to give the corresponding 3-(alkylsulfinyl)- and 3-(arylsulfinyl)butyric acids as mixtures of diastereoisomers3b-3k and 4b-4k. These are separated and the purelike and unlike diastereoisomers isolated and fully characterized (Table 4). Configurational assignments rest upon a crystal structure analysis (Figure 1) and comparison of properties in the two series.
β-内酯((S)和(R)-4-甲基-2-氧杂环丁酮,1,ent-1)可以通过(R)-和(S)-3-羟基丁酸制备。它被氢硫化钠、烷基和芳基硫醇盐分别开环,并发生逆构型。所得的3-(烷基硫)-2f、2g和3-(芳基硫)丁酸2b-2e、ent-2h-2k(见表1)在丙酮中用过氧化氢氧化,得到相应的3-(烷基亚磺酰基)-和3-(芳基亚磺酰基)丁酸,作为不同亚构型的混合物3b-3k及4b-4k。这些混合物被分离,纯亚构型和非纯亚构型被提取并完全表征(见表4)。构型的判定基于晶体结构分析(见图1)和两组化合物性质的比较。