Amine-mediated synthesis of amides from 1,3-dicarbonyl compounds through a domino diazo transfer/aminolysis process
作者:Taíssa A. Costin、Luiz G. Dutra、Adailton J. Bortoluzzi、Marcus M. Sá
DOI:10.1016/j.tet.2017.06.013
日期:2017.8
compound and the nucleophilicity of the amine, the resulting α-diazo-β-keto ester undergoes cleavage of the acyl group to give amides. A multifunctionalized γ-azido-α-diazo-β-keto ester was cleanly prepared in good yields by this one-pot protocol under practical and safe conditions, being employed in a Knoevenagel-type condensation with aromatic aldehydes to give densely functionalized diazo azido compounds
本文描述了胺作为由1,3-二羰基化合物合成重氮化合物或羧酰胺的催化剂和底物的双重作用。在合适的重氮转移剂的存在下,伯和环状仲胺充当重氮向丙二酸酯,β-酮酸酯和β-二酮的重氮转移反应的碱性催化剂。取决于1,3-二羰基化合物的结构和胺的亲核性,所得的α-重氮-β-酮酯经历酰基的裂解以得到酰胺。多功能γ-叠氮基-α-重氮-β在实际和安全的条件下,通过这一一锅操作规程,以高收率干净地制备了β-酮酯,将其用于与芳香族醛的Knoevenagel型缩合反应中,得到致密的官能化重氮叠氮基化合物。用伯胺进一步处理这些不饱和的γ-叠氮基-α-重氮-β-酮酯很容易就能以高收率得到相应的α-叠氮酰胺,它们被用于铑催化的分子内合成新型吲哚-2-羧酰胺。 C H插入。