Preparation of highly substituted 7-oxa-1-azabicyclo[2.2.1]heptanes from 4-nitro-1-butene derivatives. Route to polysubstituted piperidines
作者:Anna Budzińska、Wojciech Sas
DOI:10.1016/s0040-4020(01)00021-7
日期:2001.3
4-Nitro-1-butene derivatives 2 readily available from the palladium(0)-catalyzed C-allylation of nitroalkanes were converted into highly substituted 7-oxa-1-azabicyclo[2.2.1]heptane derivatives 6 in three steps including an intramolecular 1,3-dipolar cycloaddition reaction. Catalytic hydrogenolysis of the N–O bond in 6 afforded polysubstituted 4-hydroxypiperidines.
易于从钯(0)催化的硝基烷烃的C-烯丙基化反应中获得的4-硝基-1-丁烯衍生物2在包括分子内的三个步骤中转化为高度取代的7-氧杂-1-氮杂双环[2.2.1]庚烷衍生物6 1,3-偶极环加成反应。6中N–O键的催化氢解提供了多取代的4-羟基哌啶。