Synthesis of unnatural α-amino esters using ethyl nitroacetate and condensation or cycloaddition reactions
作者:Glwadys Gagnot、Vincent Hervin、Eloi P Coutant、Sarah Desmons、Racha Baatallah、Victor Monnot、Yves L Janin
DOI:10.3762/bjoc.14.263
日期:——
We report here on the use of ethyl nitroacetate as a glycine template to produce α-amino esters. This started with a study of its condensation with various arylacetals to give ethyl 3-aryl-2-nitroacrylates followed by a reduction (NaBH4 and then zinc/HCl) into α-amino esters. The scope of this method was explored as well as an alternative with arylacylals instead. We also focused on various [2 + 3]
我们在这里报告了使用硝基乙酸乙酯作为甘氨酸模板生产α-氨基酯的情况。首先研究将其与各种芳基缩醛缩合,得到3-芳基-2-硝基丙烯酸乙酯,然后还原(NaBH4,然后锌/ HCl)还原成α-氨基酯。探索了该方法的范围以及芳基取代基的替代方法。我们还关注了各种[2 + 3]环加成反应,其中一种导致了螺缩醛,这导致了不希望的5-(苯甲酰胺基甲基)异恶唑-3-羧酸乙酯。还研究了使用硝酸铈(IV)铵在5-亚甲基-4,5-二氢恶唑上添加硝基乙酸乙酯,并使用金(I)化学方法合成了其他带有恶唑的α-氨基酯。