A Short Diastereo- and Enantioselective Synthesis of cis-4,5-Disubstituted Oxazolidin-2-ones
作者:Dieter Enders、Ulrike Kallfass、Bert Nolte
DOI:10.1055/s-2002-19341
日期:——
The asymmetric synthesis of cis-4,5-disubstituted oxazolidin-2-ones is described. Following a four step reaction sequence of α-alkylation, 1,2-addition with subsequent carbamate protection, cyclization and concluding with cleavage of the auxiliary the title compounds are obtained in moderate yields and in excellent diastereo- and enantiomeric excesses (de = 88 - > 96%, ee > 96%).
描述了顺式4,5-二取代的噁唑烷-2-酮的非对称合成。通过α-烷基化、1,2-加成、随后的氨基甲酸酯保护、环化以及最后的辅助剂断裂这一四步反应序列,得到目标化合物,产率适中,并且具有优良的非对映体选择性和对映体过量(de = 88 - > 96%,ee > 96%)。