3-Methylazetidin-2-one and its precursors: Optical resolution and absolute configurations
作者:G.V. Shustov、A. Rauk
DOI:10.1016/0957-4166(96)00065-1
日期:1996.3
corresponding diastereomers of methyl (αS)-N-α-methylbenzyl-3-amino-2-methylpropionate 3A,B which had been separated by recrystallization of their salts 4A,B with p-toluenesulfonic acid. The absolute configurations of azetidinones (+)- and (−)-1 and their diastereomeric precursors, i.e. amino esters 3A,B, (αS)-N-α-methylbenzyl-3-amino-2-methylpropionic acids 5A,B, and (αS)-N-α-methylbenzyl-3-methylazetidin-2-ones6A
3-甲基氮杂环丁烷-2-酮-(3 R)-(+)-和(3S)-(-)-1的对映体以及3-氨基-2-甲基丙酸-(2R)-(-)-和从(αS)-N-α-甲基苄基-3-氨基-2-甲基丙酸甲酯3A,B的相应非对映异构体获得(2S)-(+)-2 ,该化合物已通过将其盐4A,B与p重结晶而分离-甲苯磺酸。氮杂环丁烷酮(+)-和(-)- 1及其非对映异构体前体的绝对构型,即氨基酯3A,B,(αS)-N - α-甲基苄基-3-氨基-2-甲基丙酸5A,B和(αS)-通过将(+)- 1转化为氨基酸(2R)-(-)-2和将氨基酸(2S)-(+)-转化为N - α-甲基苄基-3-甲基氮杂环丁烷-2-酮6A,B。 2至(-)- 1。