A convergent route to structures with multiple contiguous carbon–nitrogen bonds. The divergent role of N-acyl groups
作者:Songzhe Han、Samir Z. Zard
DOI:10.1016/j.tet.2016.05.085
日期:2016.12
to N,N-diacetyl imidazol-2-one can be followed by a second addition to N,N-di-Boc imidazol-2-one to give after reductive dexanthylation a protected tetra-amine possessing four contiguous carbon–nitrogen bonds, or even five if the starting xanthate itself bears a protected amine. The success of this sequence hinges on the difference in radical stability between radicals substituted by an N-acyl and
将黄原酸酯自由基加成到N,N-二乙酰基咪唑-2-酮上,然后第二加成N,N-二-乙酰基咪唑-2-酮,在还原性右胸腺嘧啶化后得到具有四个连续碳的受保护的四胺。 -氮键,或者如果起始黄药本身带有受保护的胺,则为五个。该序列的成功取决于被N-酰基和N-氨基甲酰基氮取代的基团之间的基团稳定性的差异,这可以控制基团的添加并防止低聚物的形成。