The synthesis and reduction of optically active 2-mercaptopropionic acid and some derivatives
作者:L. N. Owen、M. B. Rahman
DOI:10.1039/j39710002432
日期:——
toluene-α-thiolate, on methyl L-O-ptolysulphonyl-lactate, methyl L-2-chloropropionate, and sodium L-2-chloropropionate, have been used to prepare D-2-acylthio- and D-2-acylthio- and D-2-alkylthio-propionic acids and esters. Extensive racemisation occurs when an excess of thioacetate or thiobenzoate is used; this is attributed to further SN2 displacement, with acetylthio or benzoylthio as a leaving group. Concomitant
亲核置换反应,由硫代乙酸酯,硫代苯甲酸,甲硫醇和甲苯-α-硫醇盐,上甲基大号- ö - p tolysulphonyl乳酸盐,甲基大号-2-氯丙酸甲酯,和钠大号-2-氯丙酸甲酯,已被用来制备d -2- acylthio-和d -2- acylthio-和d -2-烷硫基-丙酸和酯。当使用过量的硫代乙酸酯或硫代苯甲酸酯时,会发生广泛的消旋作用。这归因于进一步的S N2取代,以乙酰硫基或苯甲酰硫基为离去基团。通过不同的机理,在保留构型的同时也发生了酰基交换。因此,D -2-乙酰基硫代丙酸甲酯与硫代苯甲酸钾产生D -2-苯甲酰基硫代丙酸甲酯。