Efficient synthesis of novel 2-spiropiperidines including an unprecedented non-symmetrical 2,6-bis-spiropiperidine
作者:Thomas M. McQueen、Samuel D. Griggs
DOI:10.1016/j.tetlet.2020.152752
日期:2021.2
Tertiary-alkyl substituted δ-amino-β-ketoesters can be readily prepared from β-amino acids, which can then undergo condensation with aldehydes to furnish novel, highly substituted 2-spiropiperidines. The method allows access to conformationally distinct structural- and regio-isomers of previously reported 2-spiropiperidines, and further expands the potential to explore three-dimensional chemical space
叔烷基取代的δ-氨基-β-酮酸酯可以很容易地从β-氨基酸制备,然后可以与醛缩合以提供新颖的,高度取代的2-spiropiperidines。该方法允许访问先前报道的2-螺哌啶类的构象上不同的结构和区域异构体,并进一步扩大了探索三维化学空间的潜力。使用3-氧杂环丁酮作为亲电试剂产生了具有合成挑战性的非对称2,6-双-双螺哌啶的第一个实例。