Stereocontrolled preparation of cis- and rans-2,6-dialkylpiperidines via diastereoselective reaction of 1-aza-4-oxabicyclo[4.3.0]nonane derivatives with Grignard reagents
作者:Hadi Poerwono、Kimio Higashiyama、Takayasu Yamauchi、Hajime Kubo、Shigeru Ohmiya、Hiroshi Takahashi
DOI:10.1016/s0040-4020(98)00863-1
日期:1998.11
We report here the syntheses of cis- and trans-2,6-disubstituted piperidines using chiral 1-aza-4-oxabicyclo[4.3.0]nonane synthon 1, which shows high reactivity toward nucleophilic attack at its C-5 position. Bicyclic compounds resembling synthon 1 were transformed to cis- and trans-2,6-disubstituted piperidine derivatives via reactions with various Grignard reagents in a stereospecific manner. Using
我们在这里报告使用手性的1-氮杂-4-氧杂双环[4.3.0]壬烷合子1合成顺式和反式-2,6-二取代的哌啶,该化合物在其C-5位置表现出对亲核攻击的高反应性。通过与各种格氏试剂以立体特异性方式反应,将类似于合成子1的双环化合物转化为顺式和反式-2,6-二取代的哌啶衍生物。使用这种方法,从单一对映体来源以对映选择性的方式合成了(+)-视神经肽A(2b)和异视神经肽A的两种对映体(3a和3b)。