Biological resolution of racemic 2-oxazolidinones. Part VI. Stereochemical inversion of (R)-5-hydroxymethyl-3-tert-butyl-2-oxazolidinone or (R)-5-hydroxymethyl-3-isopropyl-2-oxazolidinone to the corresponding (S)-isomer.
作者:Kazunori KAN、Akimasa MIYAMA、Shigeki HAMAGUCHI、Takehisa OHASHI、Kiyoshi WATANABE
DOI:10.1271/bbb1961.49.1669
日期:——
The Stereochemical inversion of (R)-5-hydroxymethyl-3-tert-butyl-2-oxazolidinone (1a) or (R)-5-hydroxymethyl-3-isopropyl-2-oxazohdinone (1b) to the corresponding (S)-isomer was accomplished via a key intermediate, (R)-3-N-ethoxycarbonyl-N-tert-butylamino-1, 2-epoxypropane (5a) or (R)-3-N-ethoxycarbonyl-N-isopropylamino-1, 2-epoxypropane (5b), in a high enantiomeric excess. (S)-1a (99% e.e.) or (S)-1b (97% e.e.) was thus obtained from the respective (R)-isomer (1a; 99% e.e., 1b; 95% e.e.).
(R)-5-羟甲基-3-叔丁基-2-恶唑烷酮(1a)或(R)-5-羟甲基-3-异丙基-2-恶唑烷酮(1b)的立体化学反转,通过关键中间体(R)-3-N-乙氧羰基-N-叔丁基氨基-1,2-环氧丙烷(5a)或(R)-3-N-乙氧羰基-N-异丙基氨基-1,2-环氧丙烷(5b),以高对映体过量成功转化为相应的(S)-异构体。因此,分别从相应的(R)-异构体(1a;99% e.e.,1b;95% e.e.)得到了(S)-1a(99% e.e.)或(S)-1b(97% e.e.)。