A new method for the preparation of unsymmetrical 1,4-substituted piperazine derivatives
作者:Aurelio Ortiz、Norberto Farfán、Herbert Höpfl、Rosa Santillan、Marı́a E. Ochoa、Atilano Gutiérrez
DOI:10.1016/s0957-4166(99)00049-x
日期:1999.2
Symmetrical and unsymmetrical N,N′-piperazine derivatives of (−)-norephedrine and o-aminophenol were synthesized stereoselectively in yields >70% by reduction of the corresponding N,N′-ethylenebisoxazolidine heterocycles. The stereochemistry at the ring fusion carbons was established by NMR spectroscopy and X-ray crystallography.
(-)-去氧麻黄碱和邻氨基苯酚的对称和不对称的N,N'-哌嗪衍生物是通过选择性还原相应的N,N'-亚乙基双恶唑烷杂环以> 70%的收率立体合成的。通过NMR光谱和X射线晶体学建立了在环稠合碳上的立体化学。